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发明名称
Improvements relating to joints for yieldable mine-roof and like supports
摘要
申请公布号
GB473577(A)
申请公布日期
1937.10.15
申请号
GB19360031279
申请日期
1936.11.16
申请人
JOSEF MEISER
发明人
分类号
E21D11/22
主分类号
E21D11/22
代理机构
代理人
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