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发明名称
Procédés de torsadage de barres en acier rapide ou en acier fondu, cylindriques pleines ou à trous de circulation d'huile, profilées pleines ou à trous, destinées en particulier à la fabrication de forets hélicoïdaux
摘要
申请公布号
FR1327714(A)
申请公布日期
1963.05.24
申请号
FR19570750854
申请日期
1957.11.05
申请人
发明人
ORY GASTON CHARLES
分类号
B21D11/14
主分类号
B21D11/14
代理机构
代理人
主权项
地址
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