Number | Name | Date | Kind |
---|---|---|---|
2755457 | Diemer et al. | Jul 1956 | |
3149281 | Lieb | Sep 1964 | |
3244979 | Hershinger | Apr 1966 | |
3524726 | Koster | Aug 1970 | |
4006414 | Parker | Feb 1977 |
Number | Date | Country |
---|---|---|
1,318,007 | May 1973 | GBX |
Entry |
---|
Schwartz et al., Indicator, IBM Technical Disclosure Bulletin, Aug. 1960, pp. 63 & 64. |