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United States Patent
3,170,914
Issue Date:
February 23, 1965
Current U.S. Class:
534/872
; 8/682; 534/641; 534/728
Current CPC Class:
C09B 62/00 (20130101); C09B 62/51 (20130101)
Current International Class:
C09B 62/00 (20060101); C09B 62/44 (20060101); C09B 62/51 (20060101)
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