Number | Name | Date | Kind |
---|---|---|---|
3891293 | Jones | Jun 1975 | |
3897130 | Donnelly et al. | Jul 1975 | |
3989336 | Rizzio et al. | Nov 1976 | |
4160573 | Weisenburger | Jul 1979 |
Number | Date | Country |
---|---|---|
948391 | Feb 1964 | GBX |
Entry |
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Fold Switch, R. H. Harris, IBM Technical Disclosure Bulletin, vol. 19, No. 10 (Mar. 1977) p. 3815. _ |