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发明名称
SEMI-AUTOMATIC TELEPHONE SYSTEM
摘要
申请公布号
CA325841(A)
申请公布日期
1932.09.06
申请号
CAD325841
申请日期
申请人
THE WESTERN ELECTRIC COMPANY
发明人
THOMAS SAMUEL SKILLMAN
分类号
主分类号
代理机构
代理人
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