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发明名称
Sign apparatus
摘要
申请公布号
US2199308(A)
申请公布日期
1940.04.30
申请号
US19380216361
申请日期
1938.06.28
申请人
RICHARD K. STEVENS
发明人
EVANS GEORGE H.
分类号
G09F11/23;G09F13/00
主分类号
G09F11/23
代理机构
代理人
主权项
地址
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