Number | Date | Country | Kind |
---|---|---|---|
3030569 | Aug 1980 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
3612207 | Cabanes | Oct 1971 | |
3695381 | Okada et al. | Oct 1972 |
Number | Date | Country |
---|---|---|
2757246 | Sep 1977 | DEX |
2914914 | Jul 1979 | DEX |
Entry |
---|
"Engineer's Relay Handbook" Hayden Book Company, Inc. .COPYRGT.1966, 1969, p. 126. |