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United States Patent
3,417,700
Issue Date:
December 24, 1968
Current U.S. Class:
102/209
; 102/229
Current CPC Class:
F42C 15/36 (20130101); F42C 15/40 (20130101)
Current International Class:
F42C 15/36 (20060101); F42C 15/40 (20060101); F42C 15/00 (20060101)
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