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发明名称
Bohrkopf fuer Gesteinsbohrer
摘要
申请公布号
DE804313(C)
申请公布日期
1951.04.19
申请号
DE1949S001019
申请日期
1949.12.13
申请人
SOCIETE D'ELECTRO-CHIMIE, D'ELECTRO-METALLURGIE ET DES ACIERIES ELECTRIQUES D'UGINE
发明人
PERRET JEAN JOSEPH
分类号
E21B10/36
主分类号
E21B10/36
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