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发明名称
Perfectionnements aux dispositifs de soutien de toit pour mines de houille et applications similaires
摘要
申请公布号
FR1220816(A)
申请公布日期
1960.05.27
申请号
FR19570734085
申请日期
1957.03.15
申请人
GULLICK LIMITED
发明人
分类号
E21D23/00
主分类号
E21D23/00
代理机构
代理人
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地址
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