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发明名称
Coal mining machine
摘要
申请公布号
US2067226(A)
申请公布日期
1937.01.12
申请号
US19350031107
申请日期
1935.07.12
申请人
CYRUS J. FITTON
发明人
YINGLING FRANK B.
分类号
E21C31/00
主分类号
E21C31/00
代理机构
代理人
主权项
地址
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