Sand pipe for rock drills,申请号US19340714750-传众专利搜索

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发明名称	Sand pipe for rock drills
摘要
申请公布号	US2006829(A)	申请公布日期	1935.07.02
申请号	US19340714750	申请日期	1934.03.09
申请人	INGERSOLL-RAND COMPANY	发明人	HANSEN CHARLES C.
分类号	E21B7/20	主分类号	E21B7/20
代理机构		代理人
主权项
地址

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