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United States Patent

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United States Patent 1,858,036
Issue Date: May 10, 1932

Current U.S. Class: 417/251 ; 417/259
Current International Class: F04B 9/02 (20060101); F04B 53/00 (20060101); F04B 53/10 (20060101); F04B 9/04 (20060101); F04B 53/14 (20060101); F04B 53/12 (20060101); F04B 23/00 (20060101); F04B 23/02 (20060101)


For U.S. patent law, rules, and procedures see MPEP.

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