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发明名称
SAFETY DEVICE FOR MECHANICALLY OPERATED ROLLS
摘要
申请公布号
CA305020(A)
申请公布日期
1930.10.21
申请号
CAD305020
申请日期
申请人
EBEN H. ELLISON, JR.
发明人
RALPH W. DEMPSEY
分类号
主分类号
代理机构
代理人
主权项
地址
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