Title:
Diaphragm
United States Patent 3117573
Inventors:
Snell, Walter A.
Publication Date:
01/14/1964
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Assignee:
Snell, Walter A.
Primary Class:
128/837
International Classes:
A61F6/08; A61F6/00
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US Patent References:
3042029Diaphragm
2538478Diaphragm