Title:
Audio frequency oscillator
United States Patent 2140840

Inventors:
Nicholas, Langer
Hoffman, Charles W. W.
Publication Date:
12/20/1938
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Assignee:
Hoffman
Primary Class:
331/47
Other Classes:
123/146.50B, 84/DIG.013, 84/1, 315/192, 331/129, 84/DIG.020, 331/106, 315/188, 331/178, 315/232, 315/231, 331/130, 315/245
International Classes:
A61B5/12; A61N1/00; H04L27/02