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120671
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120671
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United States Patent
2,085,538
Issue Date:
June 29, 1937
Current U.S. Class:
494/37
; 209/2; 494/32; 494/85
Current International Class:
B04B 5/00 (20060101); B04B 5/10 (20060101); B28C 1/00 (20060101); B28C 1/08 (20060101)
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