US Patent 10669781 Down-the-hole drill hammer having a roller bearing assembly
Patent 10669781 was granted and assigned to Center Rock on June, 2020 by the United States Patent and Trademark Office.
Is a
Current Assignee
Date Filed
December 21, 2017
0
Date of Patent
June 2, 2020
0
Patent Applicant
Patent Application Number
15850803
0
Patent Jurisdiction
Patent Number
Patent Primary Examiner
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