DEVICE OF EXTRACTING JAMMING OF PACKER FOR BORING,申请号JP19760157997-传众专利搜索

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发明名称	DEVICE OF EXTRACTING JAMMING OF PACKER FOR BORING
摘要
申请公布号	JPS5380302(A)	申请公布日期	1978.07.15
申请号	JP19760157997	申请日期	1976.12.27
申请人	DOI HIROSHI	发明人	DOI HIROSHI
分类号	E21B23/00	主分类号	E21B23/00
代理机构		代理人
主权项
地址

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