Drive head for driving pipes,申请号US19280250288-传众专利搜索

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发明名称	Drive head for driving pipes
摘要
申请公布号	US1774884(A)	申请公布日期	1930.09.02
申请号	US19280250288	申请日期	1928.01.28
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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