METHOD OF AND DEVICE FOR LOWERING OR LIFTING SINKER BARS IN BOREHOLES,申请号PL19820235661-传众专利搜索

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发明名称	METHOD OF AND DEVICE FOR LOWERING OR LIFTING SINKER BARS IN BOREHOLES
摘要
申请公布号	PL135503(B1)	申请公布日期	1985.10.31
申请号	PL19820235661	申请日期	1982.03.25
申请人		发明人
分类号	E21B;E21B23/00;(IPC1-7):E21B23/00	主分类号	E21B
代理机构		代理人
主权项
地址

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