Core drilling apparatus,申请号US19490121664-传众专利搜索

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发明名称	Core drilling apparatus
摘要
申请公布号	US2531708(A)	申请公布日期	1950.11.28
申请号	US19490121664	申请日期	1949.10.17
申请人	PENNSYLVANIA DRILLING COMPANY	发明人	STURGES FRANK C.;STROPE RUSSELL B.
分类号	E21B25/00	主分类号	E21B25/00
代理机构		代理人
主权项
地址

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