Roller bit,申请号US19270217675-传众专利搜索

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发明名称	Roller bit
摘要
申请公布号	US1778966(A)	申请公布日期	1930.10.21
申请号	US19270217675	申请日期	1927.09.06
申请人	REED ROLLER BIT COMPANY	发明人	STOKES JOHN C.
分类号	E21B4/00;E21B10/16	主分类号	E21B4/00
代理机构		代理人
主权项
地址

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