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经营范围
发明名称
Procédé et dispositif pour combattre la poussière de roche
摘要
申请公布号
FR49197(E)
申请公布日期
1938.11.28
申请号
FRD49197
申请日期
1938.02.22
申请人
发明人
DUESTERLOH ALWIN;HUXEL AUGUST
分类号
E21B21/01
主分类号
E21B21/01
代理机构
代理人
主权项
地址
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