Vibrational energy transmitter or receiver
United States Patent 2427062

Inventors:
Frank, Massa
Publication Date:
09/09/1947
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Assignee:
BRUSH DEV CO
Primary Class:
367/155
Other Classes:
381/190, 367/166, 381/356, 601/2, 367/905
International Classes:
B06B1/06; H04R17/00
US Patent References:
1980957Electro-acoustic device
2405605Signal translating device
2407271Apparatus for submarine signaling
2407329Apparatus for submarine signaling
2407643Apparatus for submarine signaling
Foreign References:
GB279878A