Air volume controlling device for water storage tanks
United States Patent 2004417

Inventors:
Albert, Penn
Publication Date:
06/11/1935
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Assignee:
PENN ELECTRIC SWITCH CO
Primary Class:
251/335.100
Other Classes:
137/413, 137/112, 137/409, 74/18.100
International Classes:
F04B11/00; F04B49/02