VACUUM SYSTEM
United States Patent 3545500

Inventors:
Bovio, Robert J.
Westlund Jr., Arnold E.
Publication Date:
12/08/1970
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Assignee:
SYLVANIA ELECTRIC PROD
Primary Class:
141/65
Other Classes:
55/511, 55/428, 55/312
International Classes:
F04B37/02; F04F9/04; F04B37/00; F04F9/00; B65B31/04




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