Automatic stage-lift flowing device,申请号US19270195739-传众专利搜索

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发明名称	Automatic stage-lift flowing device
摘要
申请公布号	US1773942(A)	申请公布日期	1930.08.26
申请号	US19270195739	申请日期	1927.06.01
申请人	ALEXANDER BOYNTON	发明人	BOYNTON ALEXANDER
分类号	E21B43/12	主分类号	E21B43/12
代理机构		代理人
主权项
地址

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