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发明名称
Perfectionnements aux bennes preneuses employées pour les travaux de sondage, forage, creusements de puits, etc.
摘要
申请公布号
FR909481(A)
申请公布日期
1946.05.09
申请号
FRD909481
申请日期
1944.10.18
申请人
发明人
CLEMENT PAUL-ROBERT
分类号
E21B11/04;E21B27/00
主分类号
E21B11/04
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代理人
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