Number | Date | Country | Kind |
---|---|---|---|
54-104007 | Aug 1979 | JPX | |
54-119420 | Sep 1979 | JPX |
Number | Name | Date | Kind |
---|---|---|---|
3616690 | Harden | Nov 1971 | |
3657475 | Peronneau et al. | Apr 1972 | |
3727002 | Pear, Jr. | Apr 1973 | |
3875331 | Hasenbalg | Apr 1975 | |
4051721 | Williams | Oct 1977 | |
4094192 | Watson et al. | Jun 1978 | |
4121049 | Roeber | Oct 1978 | |
4145748 | Eichelberger et al. | Mar 1979 | |
4293734 | Pepper, Jr. | Oct 1981 |
Entry |
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Lisk, "Electronic Keyboard"; IBM Tech. Discl. Bull.; vol. 20, No. 1; Jun. 1977; p. 259. |
Fajans, "Acoustical Touch Panel"; IBM Tech. Discl. Bull.; vol. 20, No. 7; Dec. 1977; p. 2925. |