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发明名称
An improved drill head for boring earth and rock
摘要
申请公布号
GB725381(A)
申请公布日期
1955.03.02
申请号
GB19530000141
申请日期
1953.05.13
申请人
GUSZSTAHLWERK BOCHUMER VEREIN A.G.
发明人
分类号
E21B10/20
主分类号
E21B10/20
代理机构
代理人
主权项
地址
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