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United States Patent
3,547,547
Issue Date:
December 15, 1970
Current U.S. Class:
356/427
; 250/576; 356/246
Current CPC Class:
G01N 21/07 (20130101)
Current International Class:
G01N 21/07 (20060101); G01N 21/03 (20060101)
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