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发明名称
Improvements in mine roof bar assemblies
摘要
申请公布号
GB1042744(A)
申请公布日期
1966.09.14
申请号
GB19620021069
申请日期
1962.05.31
申请人
COAL INDUSTRY (PATENTS) LIMITED
发明人
CLARKE EDWARD BRYAN
分类号
E21D17/086
主分类号
E21D17/086
代理机构
代理人
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地址
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