Silencer for drains
United States Patent 2405241
Inventors:
Smith, Henry J.
Publication Date:
08/06/1946
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Assignee:
Smith, Henry J.
Primary Class:
Other Classes:
137/549, 210/474, 137/545, 181/233, 137/540, 210/136, 137/542
International Classes:
E03C1/295; E03C1/28