Arrangement for eliminating disturbances in receiving sound waves
United States Patent 1715831

Inventors:
Walter, Hahnemann
Publication Date:
06/04/1929
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Assignee:
SIGNAL GMBH
Primary Class:
181/160
Other Classes:
367/174, 367/149, 181/158, 367/176, 181/151
International Classes:
G01S1/72; G01S1/00