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发明名称
Dispositif d'aspiration pour la poussière provenant du forage à sec des roches
摘要
申请公布号
FR1160784(A)
申请公布日期
1958.08.05
申请号
FRD1160784
申请日期
1956.10.03
申请人
HERMANN HEMSCHEIDT MASCHINENFABRIK
发明人
SCHMIDT ADALBERT
分类号
E21B21/07
主分类号
E21B21/07
代理机构
代理人
主权项
地址
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