Number | Date | Country | Kind |
---|---|---|---|
010048/76 | Aug 1976 | CH |
Number | Name | Date | Kind |
---|---|---|---|
654605 | Chalmers | Jul 1900 | |
3705424 | Harvey | Dec 1972 | |
3805939 | Ross | Apr 1974 | |
3831730 | Koeppe | Aug 1974 | |
3938642 | Van Rumpt et al. | Feb 1976 |
Number | Date | Country |
---|---|---|
2,218,065 | Apr 1972 | DT |
Entry |
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"Digital X Typewriter Keyboard," Conway, IBM Tech. Disc. Bull., vol. 18, No. 12, May 1976, pp. 4187-4190. |
"Input Keyboard", Stuckert, IBM Tech. Discl. Bull, vol. 14, No.3, Aug. 1971, pp. 952-959. |
"Semi Captive Keyboard," Kowalski, vol. 1, No. 2, Feb. 1976, p. 85 Xerox Disc. Journ. |