Communications: electrical – Selective – Having electron beam device
Patent
1978-04-04
1979-08-07
Blum, Theodore M.
Communications: electrical
Selective
Having electron beam device
43124, H04B 1100
Patent
active
041639669
ABSTRACT:
A vibratory pest control device having a sonic resonator with more than one mode of vibration and a driving element coupled to the resonator to vibrate it alternately at different frequencies.
REFERENCES:
patent: 3873960 (1975-03-01), Gates, Sr.
patent: 3879702 (1975-04-01), Mancone
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