DEVICE FOR SOUND ATTENUATION OF DRILLS,申请号EP19840402129-传众专利搜索

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发明名称	DEVICE FOR SOUND ATTENUATION OF DRILLS
摘要
申请公布号	EP0141728(B1)	申请公布日期	1989.12.20
申请号	EP19840402129	申请日期	1984.10.23
申请人	CHARBONNAGES DE FRANCE, ETABLISSEMENT PUBLIC DIT:	发明人	MARCEL, FREDERIC ETIENNE;MAUME, FRANCOIS JEAN MARIE
分类号	B25D17/11;E21B1/38;E21B17/00;E21B19/24	主分类号	B25D17/11
代理机构		代理人
主权项
地址

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