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发明名称
Transmission for slow-motion signs
摘要
申请公布号
US2528122(A)
申请公布日期
1950.10.31
申请号
US19480067959
申请日期
1948.12.29
申请人
SHELDON DREWS
发明人
DREWS SHELDON
分类号
G09F13/00
主分类号
G09F13/00
代理机构
代理人
主权项
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