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A centrifugal supercharger includes a case presenting a compressor chamber and a transmission chamber. An impeller in the compressor chamber is mounted to a shaft that extends into the transmission chamber. The impeller shaft is drivingly connected to a power input shaft by intermeshing gears provid

A centrifugal supercharger includes a case presenting a compressor chamber and a transmission chamber. An impeller in the compressor chamber is mounted to a shaft that extends into the transmission chamber. The impeller shaft is drivingly connected to a power input shaft by intermeshing gears provided on the shafts. A portion of the transmission chamber defines a fluid reservoir in which lubrication fluid is held. The intermeshing gears, as well as the bearing assemblies supporting the shafts, are located outside the fluid reservoir portion of the transmission chamber. A rotatable fluid-propelling element partly submerged in the lubrication fluid contained within the reservoir portion ensures that sufficient but not excessive lubrication fluid is supplied to the intermeshing gears and the bearing assemblies. It is particularly believed that rotation of the partly submerged fluid propelling element causes lubrication fluid to be propelled to the intermeshing gears and lubrication fluid displaced from the gears is directed to the bearing assemblies. The supercharger may alternatively include an intermediate shaft and gears drivingly connecting the impeller shaft to the input shaft, wherein the low speed gear fixed to the input shaft is partly submerged in the lubricant reservoir and serves as the lubricant slinging element.

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A centrifugal supercharger includes a case presenting a compressor chamber and a transmission chamber. An impeller in the compressor chamber is mounted to a shaft that extends into the transmission chamber. The impeller shaft is drivingly connected to a power input shaft by intermeshing gears provid

A centrifugal supercharger includes a case presenting a compressor chamber and a transmission chamber. An impeller in the compressor chamber is mounted to a shaft that extends into the transmission chamber. The impeller shaft is drivingly connected to a power input shaft by intermeshing gears provided on the shafts. A portion of the transmission chamber defines a fluid reservoir in which lubrication fluid is held. The intermeshing gears, as well as the bearing assemblies supporting the shafts, are located outside the fluid reservoir portion of the transmission chamber. A rotatable fluid-propelling element partly submerged in the lubrication fluid contained within the reservoir portion ensures that sufficient but not excessive lubrication fluid is supplied to the intermeshing gears and the bearing assemblies. It is particularly believed that rotation of the partly submerged fluid propelling element causes lubrication fluid to be propelled to the intermeshing gears and lubrication fluid displaced from the gears is directed to the bearing assemblies. The supercharger may alternatively include an intermediate shaft and gears drivingly connecting the impeller shaft to the input shaft, wherein the low speed gear fixed to the input shaft is partly submerged in the lubricant reservoir and serves as the lubricant slinging element. nd second base stations transmit different sync words in each time slot. 2. A method as claimed in claim 1, wherein transmission from each base station are divided into three time slots, and wherein the sequence of sync words comprises three sync words. 3. A method as claimed in claim 1, wherein the network further comprises a plurality of base stations operating on a second frequency. 4. A method as claimed in claim 3, further comprising transmitting the clock signal to each base station in said plurality of base stations, such that transmissions from all of the base stations are synchronized. 5. A method as claimed in claim 1, wherein the clock signal is a GPS clock signal transmitted from a GPS satellite. 6. A cellular communications network, comprising a controller and at least a first base station and second base station, each operating on a first frequency, with no other base stations operating on the first frequency located between the first base station and the second base station, wherein: each base station divides its transmissions into a plurality of time slots, wherein the controller transmits to each base station a clock signal, such that the time slots in transmissions from the base stations are transmitted substantially simultaneously, wherein a sequence of sync words is allocated for transmissions from the first base station and the same sequence of sync words is allocated for transmissions from the second base station, and wherein the controller controls the transmissions from the first and second base stations such that the first and second base stations transmit different sync words in each time slot. 7. A network as claimed in claim 6, wherein each base station divides its transmissions into three time slots, and the sequence of sync words comprises three sync words. 8. A network as claimed in claim 6, further comprising a plurality of base stations operating on a second frequency. 9. A network as claimed in claim 8, wherein the controller transmits the clock signal the first and second base station and to each base station in said plurality of base stations, such that transmissions from all of the base stations are synchronized. 10. A TDMA cellular telephone system, comprising a plurality of base station transceivers, each base station periodically transmitting a sync word chosen from a set of available sync words so that all sync words are transmitted by a base station in a sequence, and each base station operating on a frequency chosen from a set of available frequencies, wherein the base stations share the same air frame clock, the set of available frequencies are allocated to the base stations to maximise the frequency re-use distance, and base stations operating on the same frequency transmit the sync words in respective sequences which maximise the time position re-use distance. 11. A TDMA cellular telephone system, comprising a plurality of base station transceivers, each base station operating on a respective frequency chosen from a set of available frequencies, and transmitting in frames, with each frame being divided into time slots, the base stations sharing a common air frame clock such that the time slots of the base stations are synchronized, each base station transmitting in each time slot a sync word chosen from a set of available sync words so that all sync words are transmitted by a base station in a cycle which is common to all base stations, wherein the base stations are controlled such that, to the greatest extent possible, each base station transmits the sync words in a cycle which is out of phase with the adjacent base stations operating on the same frequency. 12. A method of controlling a TDMA cellular telephone system comprising a plurality of base station transceivers, each base station operating on a respective frequency chosen from a set of available frequencies, and transmitting in frames, with each frame being divided into time slots, the base stations sharing a comm on air frame clock such that the time slots of the base stations are synchronized, each base station transmitting in each time slot a sync word chosen from a set of available sync words so that all sync words are transmitted by a base station in a cycle which is common to all base stations, the method comprising controlling the base stations such that, to the greatest extent possible, each base station transmits the sync words in a cycle which is out of phase with the nearest base stations operating on the same frequency. 13. A controller for a TDMA cellular telephone system comprising a plurality of base station transceivers, each base station operating on a respective frequency chosen from a set of available frequencies, and transmitting in frames, with each frame being divided into time slots, each base station transmitting in each time slot a sync word chosen from a set of available sync words so that all sync words are transmitted by a base station in a cycle which is common to all base stations, wherein the controller comprises means for transmitting to the base stations a common air frame clock such that the time slots of the base stations are synchronized, and wherein the controller comprises means for transmitting to the base stations control signals such that, to the greatest extent possible, each base station transmits the sync words in a cycle which is out of phase with the nearest base stations operating on the same frequency. 14. A base station for a TDMA cellular telephone system comprising a plurality of base station transceivers, wherein: the base station operates on a respective frequency chosen from a set of available frequencies, and transmitting in frames, with each frame being divided into time slots, the base station transmits in each time slot a sync word chosen from a set of available sync words so that all sync words are transmitted by a base station in a cycle which is common to all base stations, the base station comprises means for detecting and operating with a common air frame clock such that the time slots of the base stations are synchronized, and the base station receives control signals which determine the phase position of the cycle in which the sync words are transmitted. 15. The base station of claim 14, wherein said cycle is out of phase with sync word transmission cycles of at least one other base station transmitting on said respective frequency. on the basis of said group of special cells, the information on special cells related to the mobile station in question is fetched from said group of special cells, information fetched on special cells is transmitted to the mobile station, and information on special cells is utilized in the mobile station. 3. The method of claim 2, wherein the information on special cells is stored in the memory of the mobile station, and a special cell is indicated in the mobile station on the basis of said information on special cells. 4. The method of claim 3, wherein in order to indicate a special cell in a mobile station, information on special cells is compared with the information on a current cell of the mobile station, and a user is informed of the mobile station being in a special cell, if the current cell is found in the information on special cells. 5. The method of claim 4, wherein to inform the user the mobile station provides a tone and/or information on the special cell is shown on the display of the mobile station. 6. The method of claim 5, wherein the information on special cells is transmitted to the mobile station in at least one of the following ways: a) as an Unstructured Supplementary Service Data message; b) in the location updating signaling; or c) as a short message. 7. The method of claim 5, wherein information on special cells is transmitted to the mobile station by storing it in a SIM card of the mobile station. 8. The method of claim 7, wherein connection of the mobile station to a network is either allowed or barred depending on whether or not said group of special cells correspondingly includes a cell to which the mobile station can connect. 9. The method of claim 8, wherein connection of the mobile station to a cell is either allowed or barred by correspondingly accepting or rejecting the request for location updating sent by the mobile station. 10. The method of claim 8, wherein the mobile station camps/does not camp on a cell on the basis of the information on special cells stored in the mobile station. 11. An arrangement for controlling local operation of a mobile station, said arrangement comprising means for processing location updating, wherein the arrangement further comprises: a group of localized cells formed for the mobile station, wherein the localized cells provide at least one of a locally tailored service, a special price or tariff for a call, or a special restriction on the mobile station's connectivity to the localized cells; means for processing said group of localized cells; means for transmitting information on said group of localized cells to the mobile station via a radio path; and means for controlling the operation of the mobile station on the basis of a list. 12. The arrangement of claim 11, wherein the means for processing said group of special cells comprise: means for fetching information on special cells, needed for the mobile station, from said group of special cells; and means for transmitting said information on special cells to the mobile station. 13. A database of a mobile communications system, wherein the database comprises a group of localized cells formed for a mobile station, wherein the localized cells provide at least one of a locally tailored service, a special price or tariff for a call, or a special restriction on the mobile station's connectivity to the localized cells. 14. The database of claim 13, wherein the group of special cells of the mobile station comprises a list of a subscriber's preferred cells. 15. The database of 14, wherein it is located either in a home location register of the mobile communication system or in an intelligent network. 16. The database of claim 14, wherein the database is located in the mobile station, preferably in its SIM card. 17. A mobile station, which is arranged to send a request for location updating, the mobile station comprising: first means for storing a group of localized cells, whe rein the localized cells provide at least one of a locally tailored service, a special price or tariff for a call, or a special restriction on the mobile station's connectivity to the localized cells; and second means for utilizing the stored group of localized cells. 18. The mobile station of claim 17, wherein said second means comprise: means for comparing information on the group of special cells with information on a current cell of the mobile station; and means for informing a user of the information on special cells achieved as the result of the comparison. 19. The mobile station of claim 18, wherein the mobile station is arranged to give an audible and/or visual indication, when a cell of the mobile station changes in such a manner that at least either an old cell or a new cell is a special cell. 20. A location updating method, in which a mobile station sends a request for location updating to a network in order to update its location information, the request for location updating is transmitted to a visitor location register in order to update the location area of the mobile station, a message on location updating is sent from the visitor location register to a home location register in order to update the location information of the mobile station, location updating is carried out in the home location register, the home location register acknowledges completion of location updating to the visitor location register, and a message on completion of location updating is sent to the mobile station, wherein the method comprises sending a service request from the visitor location register in order to ask for information on special cells of the mobile station, and sending said information on special cells to the mobile station. 21. The location updating method of claim 20, wherein said service request is sent to an intelligent network. 22. The location updating method of claim 21 wherein the information on special cells is sent from the intelligent network to the visitor location register. 23. The location updating method of claim 22, wherein the information on special cells is sent from the visitor location register to the mobile station as a short message, an Unstructured Supplementary Service Data message, or as attached to the message on completion of location updating. 24. The location updating method of claim 21, wherein said service request is sent to the home location register. 25. The location updating method of claim 24, wherein the information on special cells is sent from the home location register to the mobile station as an Unstructured Supplementary Service Data message, or from the home location register to the visitor location register as attached to an acknowledgment message on completion of location updating, and from the visitor location register to the mobile station as attached to the message on completion of location updating. 26. The location updating method of claim 25, wherein the request for location updating is accepted or rejected depending on whether the location area indicated in the request for location updating contains cells that belong to said group of special cells. 27. A handover method from an old cell to a new cell, in which a mobile station sends measurement information to a first base transceiver station serving it, and the base transceiver station transmits said information to the base station controller after an optional post-processing, and on deciding to change a second base transceiver station to serve the mobile station, the base station controller sends a handover command to the mobile station through the first base transceiver station, wherein a group of special cells has been defined for the mobile station, if at least either the old cell or the new cell is a special cell, extra information on this is included in or directly associated with the handover command, and the extra information is used for controlling the operation of the mobile station, and the g roup of special cells is associated with an information element, which if in a certain state, indicates that at least part of the information on the group of special cells is to be transmitted to the base station controller at the beginning of a call. 28. The handover method of claim 27, wherein in response to said extra information the mobile station provides an audible and/or visual indication for its user. 29. The handover method of claim 28, wherein in response to said extra information the mobile station rejects the handover command. 30. The handover method of claim 27, wherein said extra information is divided into at least two types, and the mobile station rejects the handover command, if the extra information is of a certain type. des a case of said holder. 10. A thermal air flow sensor according to claim 1, wherein a recess is formed in the back of said support member at a position corresponding to the installed position said intake air temperature sensing element. 11. A control system for an internal combustion engine, comprising the thermal air flow sensor described in claim 1 and a controller which controls the engine in accordance with an output of the engine and an output of said intake air temperature sensing element. 12. A thermal air flow sensor having a thermal element for measuring the air flow flowing through an intake passage, the thermal air flow measuring element having a heating resistor and being disposed within the intake passage, wherein an intake air temperature sensing element for sensing air temperature in the intake passage is configured to be used for other than air flow measurement, said intake air temperature sensing element and said thermal air flow measuring element being mounted together on a single support member and are positioned within the intake passage; wherein said support member is held by a holder attached to the wall of an intake pipe and has a structure whereby both sides of a portion of the support member located on the side apart from the wall of the intake pipe are easy to be taken away their heat by an air flow moving through the intake pipe, and on a thus heat-removed surface of the support member there are disposed said air flow measuring element and said intake air temperature sensing element; and wherein said thermal air flow measuring element and said intake air temperature sensing element are electrically connected respectively to conductors disposed on said support member, and the resulting electric connections are sealed with resin. 13. A thermal air flow sensor having a thermal element for measuring the air flow flowing through an intake passage, the thermal air flow measuring element having a heating resistor and being disposed within the intake passage, wherein an intake air temperature sensing element for sensing air temperature in the intake passage is configured to be usable for other than air flow measurement, said intake air temperature sensing element and said thermal air flow measuring element being mounted together on a single support member and are positioned within the intake passage; wherein said support member is cantilevered by a holder attached to the wall of an intake pipe, and said intake air temperature sensing element is disposed at one end of the support member on the side opposite to the cantilevered side and at a position more away from the holder than the air flow measuring element; and wherein said thermal air flow measuring element and said intake air temperature sensing element are electrically connected respectively to conductors disposed on the support member, and the resulting electric connections are sealed with resin. 14. A thermal air flow sensor according to claim 13, wherein an electronic circuit section related to the measurement of air flow is formed on a surface of said support member on the side where the support member is cantilevered by said holder, said electronic circuit section is sealed within said holder. 15. A thermal air flow sensor having a thermal element for measuring the air flow flowing through an intake passage, the thermal air flow measuring element having a heating resistor and being disposed within the intake passage, wherein an intake air temperature sensing element is provided for sensing air temperature in the intake passage, said intake air temperature sensing element and said air flow measuring element are respectively mounted in recesses formed each individually in a support member, are positioned within the intake passage and are electrically connected respectively to conductors disposed on the support member, and the resulting electric connections are sealed with resin.