Roller bit bearing structure,申请号US19350011651-传众专利搜索

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发明名称	Roller bit bearing structure
摘要
申请公布号	US2061141(A)	申请公布日期	1936.11.17
申请号	US19350011651	申请日期	1935.03.18
申请人	EDWIN A. PERKINS;FRANK W. BRAINARD	发明人	CRUM ROLAND R.
分类号	E21B10/10	主分类号	E21B10/10
代理机构		代理人
主权项
地址

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