Rotary core bit,申请号US19260136987-传众专利搜索

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发明名称	Rotary core bit
摘要
申请公布号	US1750744(A)	申请公布日期	1930.03.18
申请号	US19260136987	申请日期	1926.09.22
申请人	CHAMBERLAIN MAURICE S	发明人	CHAMBERLAIN MAURICE S.
分类号	E21B10/02	主分类号	E21B10/02
代理机构		代理人
主权项
地址

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