United States Patent: 1796667 ( 1

Issue Date:

Patent Grant 1796667

U.S. patent number [Application Number ] was granted by the patent office on 1931-03-17 for united states patent: 1796667 ( 1.


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United States Patent 1,796,667
Issue Date: March 17, 1931
Current U.S. Class: 91/32; 91/390; 173/10
Current CPC Class: E21B 19/086 (20130101)
Current International Class: E21B 19/00 (20060101); E21B 19/086 (20060101)


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