Number | Name | Date | Kind |
---|---|---|---|
1933321 | Emerson et al. | Oct 1933 | |
2218830 | Rose et al. | Oct 1940 | |
2915627 | Spindler | Dec 1959 | |
3290601 | Pinizzotto et al. | Dec 1966 | |
3803366 | Ishii et al. | Apr 1974 | |
4032723 | Mendoza | Jun 1977 |
Entry |
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"Secret Radio Aerials", Electrical Experimenter, Sep. 1917, pp. 300, 301, 342. |