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发明名称
SEMI-AUTOMATIC PRIVATE BRANCH EXCHANGE
摘要
申请公布号
CA747004(A)
申请公布日期
1966.11.22
申请号
CAD747004
申请日期
申请人
ERIC H. TOWNSEND
发明人
ERIC H. TOWNSEND
分类号
主分类号
代理机构
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