Vacuum seal, method and apparatus
United States Patent 1595240
Inventors:
Ogden, Minton
Publication Date:
08/10/1926
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Assignee:
Ogden, Minton
Primary Class:
Other Classes:
34/117, 34/85, 34/111, 118/50, 34/242
International Classes:
C23C14/56; D21F5/14; D21F5/00