Sound-controlling ventilating device
United States Patent 1783276

Inventors:
Bliss, Howard R.
Publication Date:
12/02/1930
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Assignee:
Bliss, Howard R.
Primary Class:
454/206
Other Classes:
96/385, 55/444, 454/906, 454/214, 454/213, 55/446, 181/292, 55/441
International Classes:
E06B7/10; F16L55/02; E06B7/02