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United States Patent
3,322,374
Issue Date:
May 30, 1967
Current U.S. Class:
244/62
; 60/202; 244/1R; 315/111.01; 244/171.5
Current CPC Class:
B64D 27/24 (20130101); Y02T 50/62 (20130101)
Current International Class:
B64D 27/00 (20060101); B64D 27/24 (20060101)
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