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发明名称
Guides for flexible elements of coal mining apparatus
摘要
申请公布号
US2756039(A)
申请公布日期
1956.07.24
申请号
US19490086153
申请日期
1949.04.08
申请人
JOY MANUFACTURING COMPANY
发明人
BARRETT ARTHUR LEE
分类号
E21C35/04
主分类号
E21C35/04
代理机构
代理人
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地址
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