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发明名称
摘要
申请公布号
DE2033844(C3)
申请公布日期
1979.08.16
申请号
DE19702033844
申请日期
1970.07.08
申请人
WIRTH MASCHINEN- UND BOHRGERAETE- FABRIK GMBH, 5140 ERKELENZ
发明人
WOLTERS, JAKOB, 5141 BEECK
分类号
E21B3/04;(IPC1-7):E21B3/02
主分类号
E21B3/04
代理机构
代理人
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地址
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