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United States Patent
2,566,458
Issue Date:
September 4, 1951
Current U.S. Class:
40/546
; 362/217.11; 362/217.12; 362/296.07; 362/296.08; 362/812
Current International Class:
F21V 8/00 (20060101); G09F 13/18 (20060101)
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