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Ink cartridge (10) for insertion into a cartridge receptacle (12) of an inkjet printer, having a housing (14), in which at least one ink storage chamber (20) is located, having at least one connection piece (24), which is provided especially on the underside (22) of the housing (14), for connecting the ink storage chamber (20) to a supply connection (26) provided at the inkjet printer when the ink cartridge (10) is inserted into the cartridge receptacle (12), and having a locking catch (32) resiliently pre-biased into a locking position, which locking catch projects from the outside of a side wall (28) of the housing (14) adjacent to the underside (22), and at which locking catch a locking edge (40) is formed by means of which the locking catch (32), in its locking position for locking the ink cartridge (10) in the cartridge receptacle (12), is lockable with a matching locking edge (for example locking aperture 59) provided on the cartridge receptacle (12), wherein the ink cartridge (10) is supported in such a manner underneath the locking catch (32) that a torque (M) holding the connection piece (24) against the supply connection (26) is exerted about that support.
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