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United States Patent
1,642,648
Issue Date:
September 13, 1927
Current U.S. Class:
135/97
; 135/116; 135/120.4; 135/87
Current International Class:
E04H 15/32 (20060101); E04H 15/58 (20060101); E04H 13/00 (20060101)
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