Title:
Audible signal device
United States Patent 2064603

Inventors:
Harrison, Gertrude A.
Publication Date:
12/15/1936
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Assignee:
Harrison, Gertrude A.
Primary Class:
434/252
Other Classes:
473/205, 473/59, 446/415, 116/67R, 446/26, 473/464, 473/234, D11/6
International Classes:
A63B69/36