Cat-head for drilling apparatus,申请号US19280280522-传众专利搜索

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发明名称	Cat-head for drilling apparatus
摘要
申请公布号	US1852842(A)	申请公布日期	1932.04.05
申请号	US19280280522	申请日期	1928.05.25
申请人	OIL WELL SUPPLY COMPANY	发明人	GREVE EDGAR E.
分类号	B66D1/74	主分类号	B66D1/74
代理机构		代理人
主权项
地址

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