First stage mechanical pump for use in a two stage vacuum pumping system
United States Patent 2721694
US Patent References:
Blower and vacuum pump
- - 1879136

Rotary compressor
- - 2243874

Elastic fluid compressor or motor
- - 2324903

Vacuum pump
- - 2492075


Inventors:
Atta, Chester Van M.
Publication Date:
10/25/1955
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Assignee:
NEW YORK AIR BRAKE CO
Primary Class:
418/206.500
Other Classes:
418/65, 244/99.600, 418/9, 418/3
International Classes:
F04C23/00
Foreign References:
GB145501A