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发明名称
Apparatus for longwall mining
摘要
申请公布号
US3041054(A)
申请公布日期
1962.06.26
申请号
US19550496962
申请日期
1955.03.28
申请人
JOY MANUFACTURING COMPANY
发明人
BALL CHARLES F.
分类号
E21C27/12
主分类号
E21C27/12
代理机构
代理人
主权项
地址
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