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发明名称
Improvements in and relating to strata bolts
摘要
申请公布号
GB808509(A)
申请公布日期
1959.02.04
申请号
GB19560003254
申请日期
1956.02.01
申请人
HADFIELDS LIMITED
发明人
STEVENSON HARRY
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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