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发明名称
Coal mining
摘要
申请公布号
US2063761(A)
申请公布日期
1936.12.08
申请号
US19350029736
申请日期
1935.07.03
申请人
CARL SCHOLZ
发明人
SCHOLZ CARL
分类号
E21F5/18
主分类号
E21F5/18
代理机构
代理人
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地址
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