Equipment for operating in mines,申请号US19570679322-传众专利搜索

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发明名称	Equipment for operating in mines
摘要
申请公布号	US2854217(A)	申请公布日期	1958.09.30
申请号	US19570679322	申请日期	1957.08.20
申请人	OTIS ELEVATOR COMPANY	发明人	BENJAMIN GEORGE W.
分类号	E21B19/087;E21D20/00	主分类号	E21B19/087
代理机构		代理人
主权项
地址

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