APPARATUS FOR PROTECTING THE SULFUR WINNING BORE-HOLE MINING HEAD AGAINST CONSEQUENCES OF BLOCKAGE IN TELESCOPED JOINTS OF BORING TOWER RIGGING,申请号PL19870264877-传众专利搜索

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发明名称	APPARATUS FOR PROTECTING THE SULFUR WINNING BORE-HOLE MINING HEAD AGAINST CONSEQUENCES OF BLOCKAGE IN TELESCOPED JOINTS OF BORING TOWER RIGGING
摘要
申请公布号	PL264877(A2)	申请公布日期	1987.12.28
申请号	PL19870264877	申请日期	1987.03.27
申请人		发明人
分类号	E21B;E21B33/08;E21B43/28;(IPC1-7):E21B/	主分类号	E21B
代理机构		代理人
主权项
地址

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