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发明名称
MINING METHOD AND APPARATUS
摘要
申请公布号
CA818995(A)
申请公布日期
1969.07.29
申请号
CAD818995
申请日期
申请人
JOY MANUFACTURING COMPANY
发明人
GLENN S. MCDOWELL
分类号
主分类号
代理机构
代理人
主权项
地址
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