Joint for drilling equipment
United States Patent 2244124

Inventors:
Benjamin, Shemeley Jerome
Publication Date:
06/03/1941
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Assignee:
Benjamin, Shemeley Jerome
Primary Class:
285/39
Other Classes:
285/310, 285/3, 411/948, 285/922, 285/85, 285/84, 166/217, 285/91, 411/322, 285/920, 285/93
International Classes:
E21B17/043; E21B17/02