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United States Patent
2,982,176
Issue Date:
May 2, 1961
Current U.S. Class:
355/2
; 355/40; 359/25; 359/26; 365/127; 430/21
Current International Class:
G03B 21/10 (20060101); G03B 21/11 (20060101); G03H 1/26 (20060101)
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