Vacuum seal and apparatus
United States Patent 1683254

Inventors:
Ogden, Minton
Publication Date:
09/04/1928
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Assignee:
Ogden, Minton
Primary Class:
34/242
Other Classes:
277/906, 226/186, 277/913, 277/409, 68/5E
International Classes:
D21F5/14; F26B13/00; D21F5/00