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United States Patent
2,904,910
Issue Date:
September 22, 1959
Current U.S. Class:
172/812
; 172/292; 172/821; 172/824
Current International Class:
E02F 3/84 (20060101); E02F 9/02 (20060101); E02F 3/76 (20060101); E02F 9/26 (20060101)
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