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经营范围
发明名称
Coal mining machine
摘要
申请公布号
US2572403(A)
申请公布日期
1951.10.23
申请号
US19480056450
申请日期
1948.10.25
申请人
STEVENSON MERLIN R
发明人
STEVENSON MERLIN R.
分类号
E21C27/22
主分类号
E21C27/22
代理机构
代理人
主权项
地址
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