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United States Patent
2,709,773
Issue Date:
May 31, 1955
Current U.S. Class:
318/16
; 244/189; 246/187A; 307/115; 318/480; 340/12.17; 340/12.5; 342/60
Current CPC Class:
G01S 13/765 (20130101); Y10T 307/76 (20150401)
Current International Class:
G01S 13/76 (20060101); G01S 13/00 (20060101)
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