Means of drilling rock, concrete, and the like,申请号US19400366792-传众专利搜索

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发明名称	Means of drilling rock, concrete, and the like
摘要
申请公布号	US2308860(A)	申请公布日期	1943.01.19
申请号	US19400366792	申请日期	1940.11.23
申请人	CLARK MALCOLM S	发明人	CLARK MALCOLM S.
分类号	E21B7/15	主分类号	E21B7/15
代理机构		代理人
主权项
地址

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