PITLESS WELL ADAPTER,申请号USD3556213-传众专利搜索

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发明名称	PITLESS WELL ADAPTER
摘要
申请公布号	US3556213(A)	申请公布日期	1971.01.19
申请号	USD3556213	申请日期	1969.08.26
申请人	MARTINSON MFG. CO. INC.	发明人	DEAN C. KRAMER
分类号	E21B33/00;(IPC1-7):E21B33/03	主分类号	E21B33/00
代理机构		代理人
主权项
地址

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