Number | Date | Country | Kind |
---|---|---|---|
3338149 | Oct 1983 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
2172677 | Hathaway | Sep 1939 | |
2395116 | Grandstaff | Feb 1946 | |
2547614 | Bedford | Apr 1951 | |
3419792 | Kasper et al. | Dec 1968 | |
3601622 | Waaben | Aug 1971 | |
3684949 | Yamachi et al. | Aug 1972 | |
3794850 | Hirose | Feb 1974 | |
4041357 | Clark | Aug 1977 | |
4090225 | Gilker et al. | May 1978 | |
4363060 | Stich | Dec 1982 | |
4389691 | Hancock | Jun 1983 | |
4392173 | Rubin | Jul 1983 | |
4459629 | Titus | Jul 1984 |
Number | Date | Country |
---|---|---|
732163 | Jan 1943 | DE2 |
311893 | Apr 1928 | GBX |
1031813 | Nov 1961 | GBX |
Entry |
---|
IBM Technical Disclosure Bulletin, vol. 14, No. 9, Feb. 1972, p. 2805. |