Number | Date | Country | Kind |
---|---|---|---|
2903780 | Feb 1980 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2102526 | Guilfoyle | Dec 1937 | |
2369807 | Solon | Feb 1945 | |
2425808 | Jakosky | Aug 1947 | |
2600101 | Faulhaber | Jun 1952 | |
2615548 | Hopkins et al. | Oct 1952 | |
3667787 | Semour | Jun 1972 | |
3730322 | Hare | May 1973 | |
3821529 | Kallage, Jr. et al. | Jun 1974 | |
4077657 | Trzeciak | Mar 1978 | |
4123641 | Murata | Oct 1978 |
Number | Date | Country |
---|---|---|
184041 | Nov 1905 | DE2 |
1234053 | DEX | |
1255117 | Nov 1967 | DEX |
2807061 | Aug 1979 | DEX |
129499 | Jan 1978 | DDX |
741462 | Dec 1955 | GBX |
Entry |
---|
R. H. Harris, "Curved Keyboard," IBM Tech. Disclosure Bulletin, vol. 20, No. 7, pp. 2784-2785, 12/77. |