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发明名称
Improved yielding mine-tubbing
摘要
申请公布号
GB370554(A)
申请公布日期
1932.04.14
申请号
GB19310004023
申请日期
1931.02.09
申请人
VEREINIGTE STAHLWERKE AKTIENGESELLSCHAFT
发明人
分类号
E21D11/18
主分类号
E21D11/18
代理机构
代理人
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地址
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