Number | Date | Country | Kind |
---|---|---|---|
58-59365[U] | Apr 1983 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
4294555 | Galaske et al. | Oct 1981 | |
4363942 | Deeg et al. | Dec 1982 | |
4440515 | Nassimbene | Apr 1984 | |
4467150 | Leitermann et al. | Aug 1984 |
Entry |
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Akers, A. L., et al.; IBM Technical Disclosure Bulletin; "Electronic Keyboard", vol. 25, No. 11B, Apr. 1983, pp. 6219, 6220. |