Combined sound activated switch and cover plate

Details Combined sound activated switch and cover plate Combined sound activated switch and cover plate

1988-08-11

1990-09-25

Bullock, B. J.

Equipment for production, distribution, or transformation of ene

Distribution, modification or control

Switch or casing therefor

D 8353, D13165, D13169

Patent

active

D03108155

REFERENCES:
patent: D87690 (1932-08-01), Sinel
patent: D221083 (1971-07-01), Kahn
patent: D226386 (1973-02-01), Sandler
patent: 2957957 (1960-10-01), Johnson
patent: 4230317 (1980-10-01), Breslow et al.

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