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United States Patent
2,075,843
Issue Date:
April 6, 1937
Current U.S. Class:
418/103
; 418/138; 418/254
Current International Class:
F04C 18/34 (20060101); F04C 18/352 (20060101); F04C 2/00 (20060101); F04C 2/352 (20060101)
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