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发明名称
Combined clock and paging system
摘要
申请公布号
US2720641(A)
申请公布日期
1955.10.11
申请号
US19540431535
申请日期
1954.05.21
申请人
INTERNATIONAL BUSINES MACHINES CORPORATION
发明人
SCHUMACHER OTTO
分类号
G04C13/03;G08B3/10
主分类号
G04C13/03
代理机构
代理人
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