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发明名称
Telephone alarm call system
摘要
申请公布号
US2483214(A)
申请公布日期
1949.09.27
申请号
US19450588623
申请日期
1945.04.16
申请人
AUTOMATIC ELECTRIC LABORATORIES INC.
发明人
LOMAX CLARENCE E.
分类号
H04M3/432
主分类号
H04M3/432
代理机构
代理人
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