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A sleeve-type cartridge case includes an upper half, a lower half connected thereto, a connecting protrusion arranged on each side plate of the upper half, and a connecting concavity arranged in each side plate of the lower half. The connecting protrusion is engaged with the connecting concavity whe

A sleeve-type cartridge case includes an upper half, a lower half connected thereto, a connecting protrusion arranged on each side plate of the upper half, and a connecting concavity arranged in each side plate of the lower half. The connecting protrusion is engaged with the connecting concavity when placing the upper half on the lower half. An amount of engagement of the connecting protrusion and concavity is larger than a difference between a width of a cartridge and a distance between two of the side plates of the upper and lower halves which are positioned inside.

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[ What is claimed is:] [1.] In combination, a case accommodating a recording medium with an index card, the case having an opening at one end thereof, the case comprising:a first half, said first half comprising a main portion and side portions arranged on both sides of said main portion;a second ha

[ What is claimed is:] [1.] In combination, a case accommodating a recording medium with an index card, the case having an opening at one end thereof, the case comprising:a first half, said first half comprising a main portion and side portions arranged on both sides of said main portion;a second half connected to said first half, said second half comprising a main portion and side portions arranged on both sides of said main portion, said side portions of said second half being arranged adjacent to said side portions of said first half;a first engagement disposed on each of said side portions of said first half; anda second engagement disposed on each of said side portions of said second half, wherein said second engagements are engaged with said first engagements to a combined depth of engagement which is larger than a difference between a width of the recording medium and a distance between two of said side portions of said first and second halves which are positioned inside, and said first and second engagements are arranged to prevent said first and second halves from being separated while the recording medium is accommodated within the case. [5.] A case for accommodating a recording medium with an index card, the case having an opening at one end thereof, the case comprising:a first half, said first half comprising a main portion and side portions arranged on both sides of said main portion;a second half connected to said first half, said second half comprising a main portion and side portions arranged on both sides of said main portion, said side portions of said second half being arranged adjacent to said side portions of said first half;a first engagement disposed on each of said side portions of said first half; anda second engagement disposed on each of said side portions of said second half, said first engagements being engaged with said second engagements to a depth of engagement sufficient to prevent said first and second halves from separating; anda protrusion disposed on said main portion of said second half, said protrusion being engaged with an end of the index card disposed on said main portion of said second half. [10.] A case for accommodating a recording medium with an index card, the case having an opening at one end thereof, the case comprising:a first half, said first half comprising a main portion and side portions arranged on both sides of said main portion;a second half connected to said first half, saidsecond half comprising a main portion and side portions arranged on both sides of said main portion, said side portions of said second half being arranged adjacent to said side portions of said first half;a first engagement disposed on each of said side portions of said first half;a second engagement disposed on each of said side portions of said second half, said second engagements being engaged with said first engagements to a depth sufficient to prevent said first and second halves from separating;a third engagement disposed on each of said side portions of said first half, said third engagement extending from the one end of the case to another end;a fourth engagement disposed on each of said side portions of said second half, said fourth engagement extending from the one end to said another end, said fourth engagement being engaged with said third engagement;a protrusion disposed on said main portion of said second half, said protrusion being engaged with an end of the index card disposed on said main portion of said second half; andan inclined face disposed on said second half at the one end of the case, said inclined face being continuously connected to an upper side of said protrusion. [11.] A case for accommodating a recording medium with an index card, the case having an opening at one end thereof, the case comprising:a first half, said first half comprising a main portion and side portions arranged on both sides of said main portion;a second half connected to said first half, said second half comprising a main portion and side portions arranged on both sides of said main portion, said side portions of said first half being arranged adjacent to and between said side portions of said second half, said side portions of said first half defining a space therebetween for accommodating a recording medium;a first engagement disposed on each of said side portions of said first half;a second engagement disposed on each of said side portions of said second half;a third engagement disposed on each of said side portions of said first half, said third engagement extending from the one end of the case to another end;a fourth engagement disposed on each of said side portions of said second half, said fourth engagement extending from the one end to said another end, said fourth engagement being slidably engaged with said third engagement; andsaid first engagements are arranged for resilient movement in a direction toward and away from said space, said first engagements being arranged for engagement with said second engagements by resilient movement of said first engagements toward said second engagements in a direction away from said space to prevent relative sliding movement between said third and fourth engagements, and said first engagements being arranged for disengagement from said second engagements by resilient movement of said first engagements toward said space to allow relative sliding movement between said third and fourth engagements. The case as claimed in claim 11, wherein said third engagement is in the form of a rail-like protrusion, and wherein said depth of engagement is parallel to the width of the recording medium.