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91301
of
91301
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United States Patent
2,854,453
Issue Date:
September 30, 1958
Current U.S. Class:
540/21
; 540/17; 540/20
Current International Class:
C07J 75/00 (20060101); C07J 71/00 (20060101); C07J 9/00 (20060101)
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