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发明名称
Telephone system
摘要
申请公布号
US1830834(A)
申请公布日期
1931.11.10
申请号
US19290371016
申请日期
1929.06.14
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
GREEN IRVING W.
分类号
H04M15/28
主分类号
H04M15/28
代理机构
代理人
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