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发明名称
Mehrteiliger Gesteinshohlbohrer
摘要
申请公布号
DE836632(C)
申请公布日期
1952.04.15
申请号
DE1950H006416
申请日期
1950.10.22
申请人
HERMANN HEMSCHEIDT
发明人
SCHMIDT ADALBERT
分类号
E21B17/03
主分类号
E21B17/03
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