Screw off packer,申请号US19350019960-传众专利搜索

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发明名称	Screw off packer
摘要
申请公布号	US2120981(A)	申请公布日期	1938.06.21
申请号	US19350019960	申请日期	1935.05.06
申请人	LAYNE	发明人	LAYNE LESLIE A.;ROCO ALBERT L.;BLOCK HAROLD C.
分类号	E21B33/12	主分类号	E21B33/12
代理机构		代理人
主权项
地址

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