Number | Name | Date | Kind |
---|---|---|---|
D238367 | Perrins et al. | Jan 1976 | |
D258360 | Mourad | Feb 1981 | |
D262622 | Beadle et al. | Jan 1982 | |
D310662 | Fellmann et al. | Sep 1990 |
Entry |
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IBM Technical Disclosure Bulletin vol. 32 No. 10A Mar. 1990 pp. 306-307 Limited-Function Keyboard For Industrial Displays. |