Number | Name | Date | Kind |
---|---|---|---|
2900591 | Jacob | Aug 1959 | |
3270268 | Carmichael et al. | Aug 1966 | |
3784894 | Silvertown | Jan 1974 | |
3857082 | Van Opijnen | Dec 1974 | |
3971977 | Hirt et al. | Jul 1976 | |
3974406 | Wehde | Aug 1976 |
Entry |
---|
"Electric Machinery", Fitzgerald et al., McGraw-Hill Book Co., 1952, p. 131. |