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发明名称
Web roll electrical speed control
摘要
申请公布号
US2039470(A)
申请公布日期
1936.05.05
申请号
US19310549127
申请日期
1931.07.07
申请人
发明人
分类号
B65H19/16
主分类号
B65H19/16
代理机构
代理人
主权项
地址
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