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发明名称
Improvements relating to roof bolts for mines
摘要
申请公布号
GB780217(A)
申请公布日期
1957.07.31
申请号
GB19550011571
申请日期
1955.04.21
申请人
VICTOR PRODUCTS (WALLSEND) LIMITED
发明人
MANN REGINALD WILLIAM
分类号
E21D21/00
主分类号
E21D21/00
代理机构
代理人
主权项
地址
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