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发明名称
Improvements in cotters for coupling mine-roof support girders to one another
摘要
申请公布号
GB758867(A)
申请公布日期
1956.10.10
申请号
GB19540011135
申请日期
1954.04.15
申请人
LE PROGRES CHARBONNIER "PROCHAR" SOCIETE COOPERATIVE
发明人
分类号
E21D17/086
主分类号
E21D17/086
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代理人
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