APPARATUS FOR SEALING OF OUTSIDE PIPE SPACE IN DRILLS,申请号BG19800047803-传众专利搜索

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发明名称	APPARATUS FOR SEALING OF OUTSIDE PIPE SPACE IN DRILLS
摘要
申请公布号	BG30867(A1)	申请公布日期	1981.09.15
申请号	BG19800047803	申请日期	1980.05.16
申请人	PETKOV,IVAN G.;GROZEV,MARTIN V.;KRIKH,BORIS V.;VLASOV, PETR A.	发明人	PETKOV,IVAN G.;GROZEV,MARTIN V.;KRIKH,BORIS V.;VLASOV, PETR A.
分类号	E21B33/12;(IPC1-7):E21B33/12	主分类号	E21B33/12
代理机构		代理人
主权项
地址

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