Controlled reluctance microphone display

Details Controlled reluctance microphone display Controlled reluctance microphone display

1974-10-15

1976-12-28

Stearman, Joel

Office supplies; artists and teachers materials

Teaching material

Demonstrator or exhibitor

D1907

Patent

active

D02428563

REFERENCES:
patent: 3313041 (1967-04-01), Weigang
Symbol Sourcebook, Copyright 1972, p. 128, Wavefronts Symbol at lower left side of page.

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