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United States Patent
3,072,237
Issue Date:
January 8, 1963
Current U.S. Class:
194/211
; 194/212; 194/217; 194/239; 194/317; 221/129; 221/218; 902/11; 902/13; 902/7
Current International Class:
G07F 7/04 (20060101); G07F 7/00 (20060101)
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