Sound excluding window
United States Patent 2040049

Inventors:
Julius, Kahn
Macleod, Donald K.
Publication Date:
05/05/1936
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Assignee:
TRUSCON STEEL CO
Primary Class:
454/225
Other Classes:
454/217, 454/906, 49/65
International Classes:
E06B7/04; E06B7/02