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United States Patent
2,703,399
Issue Date:
March 1, 1955
Current U.S. Class:
342/59
; 102/214; 244/3.14; 342/60; 342/62; 342/68; 342/88
Current CPC Class:
F42C 11/00 (20130101); F42C 13/047 (20130101)
Current International Class:
F42C 13/00 (20060101); F42C 13/04 (20060101); F42C 11/00 (20060101)
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