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United States Patent
3,196,579
Issue Date:
July 27, 1965
Current U.S. Class:
446/92
; 52/DIG.4; 52/73
Current CPC Class:
A63H 33/046 (20130101); Y10S 52/04 (20130101)
Current International Class:
A63H 33/04 (20060101)
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