Title:
Chemical feeding apparatus and automatic control therefor
United States Patent 2163436

Inventors:
Gwynne, Raymond
Mason, Walden W.
Publication Date:
06/20/1939
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Assignee:
Gwynne, Raymond
Mason, Walden W.
Primary Class:
137/209
Other Classes:
137/203, 210/149, 251/75, 137/493.600, 210/205, 417/398, 417/375, 137/879, 92/94, 166/90.100
International Classes:
E21B43/34