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发明名称
Tiefbohrer fuer laufende Bohrstangen
摘要
申请公布号
DE729898(C)
申请公布日期
1943.01.04
申请号
DE1936M133896D
申请日期
1936.03.15
申请人
MITTELDEUTSCHE STAHLWERKE AG.
发明人
分类号
B23B51/04
主分类号
B23B51/04
代理机构
代理人
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地址
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