Number | Date | Country | Kind |
---|---|---|---|
8631523[U] | Nov 1986 | DEX |
Number | Name | Date | Kind |
---|---|---|---|
1931875 | Oppenheim | Oct 1933 | |
2941061 | Bowers | Jun 1960 | |
4368380 | Igashira et al. | Jan 1983 | |
4377148 | Ishida | Mar 1983 | |
4389354 | Endou et al. | Jun 1983 | |
4463737 | Berg et al. | Aug 1984 | |
4717808 | Cyll et al. | Jan 1988 |
Number | Date | Country |
---|---|---|
690362 | Sep 1930 | FRX |
61-145349 | Jul 1986 | JPX |
Entry |
---|
Kahr, Der Kaltleiter, Siemens Components, 23, (1985), vol. 4, pp. 152-157. |