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United States Patent
3,098,663
Issue Date:
July 23, 1963
Current U.S. Class:
285/43
; 277/606; 277/625; 277/626; 285/136.1
Current CPC Class:
E04D 13/1471 (20130101)
Current International Class:
E04D 13/14 (20060101); E04D 13/147 (20060101)
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