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发明名称
TELEPHONE OPERATOR SERVICE INDICATOR AND CHECK CIRCUIT
摘要
申请公布号
CA777270(A)
申请公布日期
1968.01.30
申请号
CAD777270
申请日期
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
CHARLES E. GERMANTON
分类号
主分类号
代理机构
代理人
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