Vibratory system
United States Patent 2161489

Inventors:
Leonard, Vieth
Wiebusch, Charles F.
Yenzer, George R.
Publication Date:
06/06/1939
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Assignee:
BELL TELEPHONE LABOR INC
Primary Class:
369/147
International Classes:
A01M23/04; H03F1/36; H04R3/00; H04R9/12; H04R9/16; A01M23/00; H03F1/34; H04R9/00