Title:
Collapsible valve and method of making same
United States Patent 1702974

Inventors:
Macdonald, William W.
Publication Date:
02/19/1929
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Assignee:
SPALDING & BROS AG
Primary Class:
137/846
Other Classes:
137/223, 446/222, 383/48, 473/611, 116/DIG.009
International Classes:
F16K15/20; F16K15/00