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1. A structure holding a memory device for installation in an ink jet printer that has a holding portion with an ink supply needle, a projecting member and a plurality of printer electrodes, comprising:the memory device, the memory device including a semiconductor memory and a plurality of electrodes which, when the structure is installed in the ink jet printer, are respectively contacted by corresponding printer electrodes, the electrodes lying in a plane at an electrode region; anda body having a first wall portion and a second wall portion that is substantially orthogonal to the first wall portion, the memory device being mounted to the first wall portion so that the electrodes face outward, the second wall portion having an aperture dimensioned and disposed to receive the projecting member when the structure is installed in the ink jet printer, the aperture being located in the second wall portion such that the aperture is intersected by a plane that is perpendicular to the plane of the electrodes and that bisects the electrode region.
2. A structure as in claim 1, wherein at least some of the electrodes are rectangular.
3. A structure as in claim 1, wherein at least one of the electrodes is electrically connected to the semiconductor memory.
4. A structure as in claim 1, further comprising a substrate,wherein the semiconductor memory and the electrodes are disposed on the substrate.
5. A structure as in claim 4, wherein the semiconductor memory is located on a first surface of the substrate, and the electrodes are disposed on a second surface of the substrate.
6. A structure as in claim 4, wherein the substrate is rectangular.
7. A structure as in claim 4, wherein the substrate is shaped to receive a mounting projection of the first wall portion on which the substrate is mounted.
8. A structure as in claim 1,wherein the electrodes are arranged in a first row and a second row that is longer than said first row, andwherein said second row of electrodes is closer to the aperture than said first row.
9. A structure as in claim 8, wherein the electrodes in the first row are arranged in a staggered manner relative to the electrodes in the second row.
10. A structure as in claim 1, wherein the body is a container for holding ink.
11. A structure as in claim 1, further comprising:a first retaining member extending outward from said body.
12. A structure as in claim 11,wherein, the holding portion of the ink jet printer has a first insertion portion for receiving the first retaining member of the structure and which is of a first insertion portion width, and a width of the first retaining member is substantially the same as the first insertion portion width.
13. A structure as in claim 11, wherein the first retaining member has a first side surface, and the first side surface has a first sidewards extending projection.
14. A structure as in claim 13, wherein the first sidewards extending projection is dimensioned and disposed so that, during installation of the structure in the ink jet printer, the first sidewards extending portion engages a first surface of the holding portion and produces a perceptible click when the structure is properly mounted.
15. A structure as in claim 11, wherein the first retaining member is substantially aligned with at least one said electrode in a vertical direction when the structure is oriented as if installed in the ink jet printer.
16. A structure as in claim 11, further comprisinga second retaining member extending outward from said body.
17. A structure as in claim 16,wherein, the holding portion of the ink jet printer has a second insertion portion for receiving the second retaining member of the structure and which is of a second insertion portion width, and a width of the second retaining member is substantially the same as the second insertion portion width.
18. A structure as in claim 16, wherein the second retaining member has a second side surface, and the second side surface has a second sidewards extending projection.
19. A structure as in claim 18, wherein the second sidewards extending projection is dimensioned and disposed so that, during installation of the structure in the ink jet printer, the second sidewards extending portion engages a second surface of the holding portion.
20. A structure as in claim 1, wherein, when the aperture receives the projecting member as the structure is installed in the ink jet printer, the aperture guides and orients the structure.
21. A structure as in claim 1,wherein the body includes an ink supply port formed in the second wall portion and configured to receive the needle, the ink supply port having an opening at a leading end, andwherein the aperture is configured so that, when the aperture receives the projecting member as the structure is installed in the ink jet printer, the aperture guides and orients the structure so that the opening of the ink supply port is oriented perpendicular to the needle before the leading end of the ink supply port reaches the needle.
22. A structure as in claim 1, wherein, when the structure is viewed from below when oriented as if installed in the ink jet printer, the aperture includes a first section and a second section that is substantially perpendicular to the first section.
23. A structure as in claim 22, wherein the first section is open to a side surface of the body.
24. An ink jet printer, comprising:a holding portion, configured to accommodate an ink cartridge according to claim 1, and including at a bottom region an ink supply needle, an ink cartridge-pressing member, and a vertical projecting member extending upward from the bottom region at a position between the ink supply needle and the ink cartridge-pressing member, anda plurality of electrical elastic contact forming member located at a side region of the holding portion.
25. An ink jet printer, comprising:a holding portion, configured to accommodate an ink cartridge according to claim 11, and including a recess configured to guide the first side portion during installation of the ink cartridge in the printer.
26. An ink jet printer, comprising:a holding portion, configured to accommodate an ink cartridge according to claim 14, and including the first surface configured to guide the first sidewards extending projection during installation of the ink cartridge in the printer.
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