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发明名称
Improvements in and relating to clamping devices for mining, quarrying and tunnelling purposes
摘要
申请公布号
GB348876(A)
申请公布日期
1931.05.21
申请号
GB19300014713
申请日期
1930.05.13
申请人
ALADAR SCHAFER
发明人
分类号
E21B15/00
主分类号
E21B15/00
代理机构
代理人
主权项
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