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经营范围
发明名称
PERFECTIONNEMENT AUX COIFFES POUR ETANCONS DE MINES.
摘要
申请公布号
BE543659(A1)
申请公布日期
1959.09.11
申请号
BE19550543659
申请日期
1955.12.15
申请人
DOWTY MINING EQUIPMENT LIMITED
发明人
分类号
(IPC1-7):E21D
主分类号
(IPC1-7):E21D
代理机构
代理人
主权项
地址
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