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发明名称
SUBSCRIBER SIGNALLING SYSTEM
摘要
申请公布号
CA517448(A)
申请公布日期
1955.10.11
申请号
CAD517448
申请日期
申请人
ZENITH RADIO CORPORATION
发明人
ERWIN M. ROSCHKE;ROSWELL H. HERRICK
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主分类号
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