Two-post three-shaft draw works,申请号US19280288714-传众专利搜索

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发明名称	Two-post three-shaft draw works
摘要
申请公布号	US1763511(A)	申请公布日期	1930.06.10
申请号	US19280288714	申请日期	1928.06.27
申请人	GOESER EDWIN W	发明人	GOESER EDWIN W.
分类号	E21B19/00	主分类号	E21B19/00
代理机构		代理人
主权项
地址

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