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发明名称
DOPPELROHRBOHRGESTAENGE MIT GEWINDEVERBINDUNG
摘要
申请公布号
DD217682(A3)
申请公布日期
1985.01.16
申请号
DD19810236086
申请日期
1981.12.22
申请人
VEB HYDROGEOLOGIE,5500 NORDHAUSEN, ROTHENBURGSTR. 12,DD
发明人
BECKERT,HERMANN,DD
分类号
E21B17/042;(IPC1-7):E21B17/042
主分类号
E21B17/042
代理机构
代理人
主权项
地址
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