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2140536
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Patent Grant
2140536
References
Source
Patent Number
2,140,536
Date Filed
Not available
Date Issued
Tuesday, December 20, 1938
85 years ago
CPC
C09B29/3617 - containing a six-membered heterocyclic with only one nitrogen as heteroatom
US Classifications
008 - Bleaching and dyeing
534 - Organic compounds
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