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发明名称
VOICE FREQUENCY RINGER
摘要
申请公布号
CA457064(A)
申请公布日期
1949.05.31
申请号
CAD457064
申请日期
申请人
FEDERAL TELEPHONE AND RADIO CORPORATION
发明人
WALTER BRANDT
分类号
主分类号
代理机构
代理人
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