Number | Name | Date | Kind |
---|---|---|---|
1486049 | Spring | Mar 1924 | |
1843018 | Drake et al. | Jan 1932 | |
2787704 | Boelens et al. | Apr 1957 | |
3742511 | Smith et al. | Jun 1973 |
Entry |
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Radio-Electronics: Nov. 1958, pp. 48-51, "Two Multiband Transistor Sets," by Robert F. Scott. |
International Dictionary of Physics & Electronics: Van Nostrand Company Inc., 1956, p. 190. |