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发明名称
Outil à saigner ou entailler actionné mécaniquement pour l'extraction du charbon et autres minéraux
摘要
申请公布号
FR827743(A)
申请公布日期
1938.05.03
申请号
FRD827743
申请日期
1937.10.11
申请人
发明人
NEUENBURG HENRY
分类号
E21C25/64
主分类号
E21C25/64
代理机构
代理人
主权项
地址
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