Number | Name | Date | Kind |
---|---|---|---|
1717765 | Dunn | Jun 1929 | |
3945482 | Eunbinder | Mar 1976 | |
4042777 | Bequaert et al. | Aug 1977 | |
4522518 | Schmidt | Jun 1985 | |
4579470 | Casey | Apr 1986 | |
4761522 | Allen | Aug 1988 | |
4769516 | Allen | Sep 1988 | |
4824268 | Diernisse | Apr 1989 |
Number | Date | Country |
---|---|---|
2725677 | Dec 1977 | DEX |
2587815 | Mar 1987 | FRX |
WO8800137 | Jan 1988 | WOX |
2000083 | Jan 1977 | GBX |
2122947 | Jan 1984 | GBX |
Entry |
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Boyd, "Keyboard Training", British Printer, Sep. 1977, pp. 20-21. |
Conway, "Digital X Typewriter Keyboard", IBM Technical Disclosure Bulletin, vol. 18, #12, pp. 4187-4190, May, 1976. |
Truelson, "Single-Key Cursor Control" IBM Technical Disclosure Bulletin, vol. 26, #7B, pp. 3746-3747, Dec. 1983. |
IBM Technical Disclosure Bulletin, "Compact Computer Keyboard", vol. 27, #10A, pp. 5640-5642, Mar. 1985. |