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发明名称
Permanent-signal indicating system
摘要
申请公布号
US2591579(A)
申请公布日期
1952.04.01
申请号
US19480057381
申请日期
1948.10.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MICHAL JOSEPH
分类号
H04M3/14
主分类号
H04M3/14
代理机构
代理人
主权项
地址
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