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发明名称
Radio frequency display sign
摘要
申请公布号
US2635215(A)
申请公布日期
1953.04.14
申请号
US19490078655
申请日期
1949.02.26
申请人
SHOEMAKER FRANK M
发明人
SHOEMAKER FRANK M.
分类号
H05B41/24
主分类号
H05B41/24
代理机构
代理人
主权项
地址
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