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经营范围
发明名称
Yielding attachments for roof supporting constructions in mines comprising members, which, when in action, pivot about sliding fulcrum blocks
摘要
申请公布号
GB459576(A)
申请公布日期
1937.01.11
申请号
GB19360009313
申请日期
1936.03.30
申请人
FERDINAND RICHARDS;GUEST KEEN BALDWINS IRON AND STEEL COMPANY LIMITED
发明人
分类号
E21D11/22;E21D11/24
主分类号
E21D11/22
代理机构
代理人
主权项
地址
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