Automatic orifice plate changer,申请号US19610140556-传众专利搜索

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发明名称	Automatic orifice plate changer
摘要
申请公布号	US3144238(A)	申请公布日期	1964.08.11
申请号	US19610140556	申请日期	1961.09.25
申请人	WILLIAMS JOE M	发明人	WILLIAMS JOE M.
分类号	E21B34/02	主分类号	E21B34/02
代理机构		代理人
主权项
地址

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