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发明名称
VERFAHREN ZUR MECHANISCHEN HERSTELLUNG KREISRUNDER UNTERIRDISCHER HOHLRAEUME IM ERDREICH
摘要
申请公布号
DD132804(A1)
申请公布日期
1978.11.01
申请号
DD19770201075
申请日期
1977.09.19
申请人
HILLE,KLAUS,DD
发明人
HILLE,KLAUS,DD
分类号
E21B21/00;(IPC1-7):E21B21/00
主分类号
E21B21/00
代理机构
代理人
主权项
地址
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