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发明名称
Improvements in couplings for lagging irons in mines
摘要
申请公布号
GB769430(A)
申请公布日期
1957.03.06
申请号
GB19530026944
申请日期
1953.10.01
申请人
KARL MARIA GROETSCHEL
发明人
分类号
B64D39/00;E21D17/01;E21D17/086
主分类号
B64D39/00
代理机构
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