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发明名称
Verfahren zur Herstellung von hohlem Gesteinsbohrstahl
摘要
申请公布号
DE948681(C)
申请公布日期
1956.09.06
申请号
DE1953H017890
申请日期
1953.10.07
申请人
HELLEFORS BRUKS AKTIEBOLAG
发明人
ERIKSSON DAN INGEMAR BERNHARD;FOOGDE CARL ERIK
分类号
B21B23/00
主分类号
B21B23/00
代理机构
代理人
主权项
地址
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