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发明名称
Variable speed control for stock quotation projectors
摘要
申请公布号
US1944173(A)
申请公布日期
1934.01.23
申请号
US19290357449
申请日期
1929.04.23
申请人
NEWS PROJECTION CORPORATION
发明人
EITZEN AUGUST D.
分类号
G03B21/134
主分类号
G03B21/134
代理机构
代理人
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地址
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