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发明名称
Changeable sign
摘要
申请公布号
US2153850(A)
申请公布日期
1939.04.11
申请号
US19370168235
申请日期
1937.10.09
申请人
STEDMAN HARRY E
发明人
STEDMAN HARRY E.
分类号
G09F13/16
主分类号
G09F13/16
代理机构
代理人
主权项
地址
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