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发明名称
Call system
摘要
申请公布号
US1780711(A)
申请公布日期
1930.11.04
申请号
US19290396466
申请日期
1929.10.01
申请人
JEAN LICHTER IRA
发明人
LICHTER IRA JEAN
分类号
G08B5/36
主分类号
G08B5/36
代理机构
代理人
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