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United States Patent

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United States Patent 3,025,772
Issue Date: March 20, 1962

Current U.S. Class: 404/18 ; 428/117; 52/220.3; 52/309.1; 52/318; 52/337; 52/388; 52/477
Current International Class: E01C 11/24 (20060101); E01C 9/00 (20060101); E01C 11/26 (20060101); E04F 15/14 (20060101); E04F 15/12 (20060101)


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

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