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发明名称
Transmission for drilling machines
摘要
申请公布号
US2547079(A)
申请公布日期
1951.04.03
申请号
US19480021649
申请日期
1948.04.17
申请人
CONSTRUCTIONS ELECTRO-MECANIQUES DE SAINT-ETIENNE
发明人
GERENTES JEAN
分类号
E21B44/02
主分类号
E21B44/02
代理机构
代理人
主权项
地址
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