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发明名称
Locking method for clamping devices of mine road walling
摘要
申请公布号
US2793719(A)
申请公布日期
1957.05.28
申请号
US19520291467
申请日期
1952.06.03
申请人
WILHELM LANGERBEIN
发明人
LANGERBEIN WILHELM
分类号
E21D11/22
主分类号
E21D11/22
代理机构
代理人
主权项
地址
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