Number | Date | Country | Kind |
---|---|---|---|
2516/78 | Mar 1978 | CHX |
Number | Name | Date | Kind |
---|---|---|---|
3732389 | Kaelin et al. | May 1973 | |
3811025 | Bach | May 1974 | |
3990070 | Spence | Nov 1976 | |
4065754 | Miura et al. | Dec 1977 | |
4077036 | Avakian et al. | Feb 1978 | |
4092640 | Satoh | May 1978 |
Entry |
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"Scanned Optical Keyboard", J. E. Fox, IBM Tech. Dis. Bull'n., vol. 20, No. 9, Feb. 1978, pp. 3615-3616. |