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An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked togethe

An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked together to produce the desired arc voltage and current between an electrode and the workpiece. The arc welder includes a welding current to control the current wave shape through the electrode and to control or increase the voltage through the electrode.

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An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked togethe

An electric arc welder powered by a plurality of liquid organic fuel cells. The fuel cells use a methanol/water mixture as the organic feed. The fuel cells produce carbon dioxide as a reactive product which is used an a shielding gas during the arc welding process. The fuel cells are stacked together to produce the desired arc voltage and current between an electrode and the workpiece. The arc welder includes a welding current to control the current wave shape through the electrode and to control or increase the voltage through the electrode. n outer direction along with separation of the brake pedal from the operating shaft caused by a pressing operation of the brake pedal; and the engaging step portions, each being formed on an edge of each of the clearance holes on its one end. 3. The stop lamp switch according to claim 2, wherein a contact pressure spring for energizing the movable contact toward the fixed contact is interposed between the movable contact and the bottom wall of the case, and a return spring for energizing the operating shaft in such a direction that the operating shaft is projected from the guide hole is provided between the operating shaft and the bottom wall; and the cover body has position regulating pieces respectively abutting on vicinities of both the free ends of the engaging spring so as to hold the actuator in a state where the movable contact is separated from the fixed contact due to movement of the actuator, each of the position regulating pieces being provided in a projected manner at a position allowing cancellation of abutment of the engaging spring simultaneously with disengagement of both the free ends from engaging portions of the spring regulating member. 4. A method for attaching the stop lamp switch according to claim 2, comprising: penetrating the operating shaft of the stop lamp switch through an attachment hole of an attachment bracket opposing to the brake pedal of the vehicle so that a tip of the operating shaft abuts on the brake pedal; pressing the stop lamp switch against the attachment bracket until an engaging portion of the operating shaft is penetrated through the attachment hole so as to push the other end of the operating shaft into the cylindrical actuator, thereby fixing the operating shaft to the attachment bracket; and simultaneously with fitting of a connector to the connector connection part of the stop lamp switch, pressing the protruding working piece of the spring regulating member with the connector so as to push the protruding working piece into the case. cond elastic dome, and the elastic section of the first elastic dome having a height greater than that of the elastic section of the second elastic dome. 8. The key structure of claim 1, wherein the keyboard further includes a circuit board equipped with a lighting element which corresponds to the key cap; the key cap being transparent; the lighting element generating light when the key cap being moved to the depressed position and turning off the light when the key cap being moved away from the depressed position; the elastic plate having an aperture located between the first elastic dome and the second elastic dome and corresponding to the lighting element for allowing the lighting element to pass through. f pitch detection errors. Embodiments are disclosed for providing finger/hand interaction for expressive control, a microphone enclosure that mitigates audio feedback, and for providing rhythmic feedback to the player through mechanical vibrations induced in the device.