Number | Date | Country | Kind |
---|---|---|---|
4158/78 | Feb 1978 | GBX |
Number | Name | Date | Kind |
---|---|---|---|
2742631 | Rajchman et al. | Apr 1956 | |
3274389 | Schmermund | Sep 1966 | |
4157481 | Walton | Jun 1979 |
Number | Date | Country |
---|---|---|
2410314 | Sep 1975 | DEX |
Entry |
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Fujiwara et al., Photointerrupters, National Technical Report, vol. 22, No. 1, pp. 41-51, 2/76. |
Rice et al., ELPC Direct Readin Memory Drum, IBM Tech. Disc. Bul., vol. 3, No. 8, 1/61, pp. 55-56. |
Anacker et al., Beam-Operated Memory Cells, IBM Tech. Disc. Bul., vol. 9, No. 6, 11/66, pp. 737-738. |
Astrahan, EL-PC Keyboard, IBM Tech. Disc. Bul., vol. 13, No. 3, 8/60, pp. 65-66. |