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经营范围
发明名称
PILLAR AND STALL MINING ROOF SUPPORT
摘要
申请公布号
US3512364(A)
申请公布日期
1970.05.19
申请号
USD3512364
申请日期
1968.06.18
申请人
A.G. WILD & CO. LTD.
发明人
ELLIS HOLLAND
分类号
E21D17/02;E21D23/00;E21D23/06;(IPC1-7):E21D23/00
主分类号
E21D17/02
代理机构
代理人
主权项
地址
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