Well pipe elevator hinge,申请号US19310547810-传众专利搜索

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发明名称	Well pipe elevator hinge
摘要
申请公布号	US1843992(A)	申请公布日期	1932.02.09
申请号	US19310547810	申请日期	1931.06.30
申请人	BYRON-JACKSON CO.	发明人	SMITH NELSON K.
分类号	E21B19/06	主分类号	E21B19/06
代理机构		代理人
主权项
地址

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