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United States Patent
3,462,707
Issue Date:
August 19, 1969
Current U.S. Class:
372/40
; 252/301.4R; 359/343; 372/68
Current International Class:
H01S 3/17 (20060101); C03C 3/12 (20060101); C03C 4/00 (20060101); C03C 3/14 (20060101)
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