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发明名称
SERVICE OBSERVING ON TOLL CORDS AND TRUNKS
摘要
申请公布号
CA520936(A)
申请公布日期
1956.01.17
申请号
CAD520936
申请日期
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
VICTOR E. ROSENE
分类号
主分类号
代理机构
代理人
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