Cast iron pump with a “LEIMAN BROS. AIR PUMP / PAT'D JUNE 04 / MAR 08” inscription. Charles EH Armbruster used this pump for an iron lung of his own invention.
Ref: William H. Leiman and George W. Leiman, “Rotary Pump,” US Patent 762,539 (June 14, 1904).William H. Leiman and George W. Leiman, “Blower,” US Patent 883,464 (March 31, 1908) .
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