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发明名称
Sign
摘要
申请公布号
US2165910(A)
申请公布日期
1939.07.11
申请号
US19390250264
申请日期
1939.01.11
申请人
OWEN HOUSHOLDER;DAVID C. COHEN
发明人
TROJAN JOSE
分类号
G09F13/00
主分类号
G09F13/00
代理机构
代理人
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