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发明名称
Core plug
摘要
申请公布号
US2231140(A)
申请公布日期
1941.02.11
申请号
US19390278797
申请日期
1939.06.12
申请人
RICHARDSON CHARLES M
发明人
RICHARDSON CHARLES M.
分类号
B65H75/08
主分类号
B65H75/08
代理机构
代理人
主权项
地址
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