United States Patent: 3714898

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United States Patent

3,714,898

Issue Date:

February 6, 1973

Current U.S. Class: 102/215; 244/3.14; 340/870.24; 342/54; 356/5.08; 89/6

Current CPC Class: F41G 7/30 (20130101); F42C 17/04 (20130101); F42C 13/047 (20130101); F42C 13/00 (20130101)

Current International Class: F41G 7/20 (20060101); F42C 17/00 (20060101); F42C 13/04 (20060101); F42C 17/04 (20060101); F42C 13/00 (20060101); F41G 7/30 (20060101)

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Current U.S. Class:	102/215; 244/3.14; 340/870.24; 342/54; 356/5.08; 89/6
Current CPC Class:	F41G 7/30 (20130101); F42C 17/04 (20130101); F42C 13/047 (20130101); F42C 13/00 (20130101)
Current International Class:	F41G 7/20 (20060101); F42C 17/00 (20060101); F42C 13/04 (20060101); F42C 17/04 (20060101); F42C 13/00 (20060101); F41G 7/30 (20060101)