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United States Patent
2,963,378
Issue Date:
December 6, 1960
Current U.S. Class:
106/1.25
; 106/169.43; 106/489; 359/539; 523/172; 523/217
Current International Class:
C03C 17/06 (20060101); G02B 5/12 (20060101); G02B 5/128 (20060101)
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