Positive displacement-type hammer drill,申请号US19560567701-传众专利搜索

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发明名称	Positive displacement-type hammer drill
摘要
申请公布号	US2800884(A)	申请公布日期	1957.07.30
申请号	US19560567701	申请日期	1956.02.24
申请人	GULF RESEARCH & DEVELOPMENT COMPANY	发明人	MORI ERNEST A.
分类号	E21B4/14	主分类号	E21B4/14
代理机构		代理人
主权项
地址

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