71309262
Dec 23, 1930
Aug 11, 1931
PUMPING AND COMPRESSING APPARATUS-NAMELY, [ COMPRESSORS FOR AIR AND OTHER GASES, VACUUM PUMPS UNITS WHICH INCLUDE PRIME MOVERS FOR OPERATING THE PUMPS AND COMPRESSORS, ] METALLIC VALVES AND UNITS CONTAINING THE SAME FOR PUMPING, COMPRESSING, AND GENERAL PURPOSES, AND PARTS THEREOF
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