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发明名称
TELEPHONE SYSTEM
摘要
申请公布号
CA441181(A)
申请公布日期
1947.05.06
申请号
CAD441181
申请日期
申请人
AUTOMATIC ELECTRIC LABORATORIES INC.
发明人
JOHN ELLIS OSTLINE
分类号
主分类号
代理机构
代理人
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