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发明名称
Foret à roche, en particulier foret tournant ou mèche pour sel, charbon ou roche, à garnitures en métal dur
摘要
申请公布号
FR813130(A)
申请公布日期
1937.05.26
申请号
FRD813130
申请日期
1936.11.05
申请人
N. V. WALLRAMIT HANDEL MAATSCHAPPIJ
发明人
分类号
E21B10/00
主分类号
E21B10/00
代理机构
代理人
主权项
地址
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