MULTIPLE STAGE COAL SEAM FRACING METHOD,申请号MW19870000029-传众专利搜索

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发明名称	MULTIPLE STAGE COAL SEAM FRACING METHOD
摘要
申请公布号	MW2987(A1)	申请公布日期	1987.12.09
申请号	MW19870000029	申请日期	1987.04.24
申请人	WILLIAM PERLMAN	发明人
分类号	E21B43/00;E21B43/267;E21B43/27;(IPC1-7):E21B43/267	主分类号	E21B43/00
代理机构		代理人
主权项
地址

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