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发明名称
Perfectionnements aux dispositifs pour l'étude des terrains traversés par un sondage
摘要
申请公布号
FR939401(A)
申请公布日期
1948.11.15
申请号
FRD939401
申请日期
1946.10.29
申请人
SOCIETE DE PROSPECTION ELECTRIQUE
发明人
分类号
E21B47/00;G01V3/20
主分类号
E21B47/00
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