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发明名称
Telephone system
摘要
申请公布号
US1930612(A)
申请公布日期
1933.10.17
申请号
US19320599732
申请日期
1932.03.18
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
GETZ EMIL L.
分类号
H04M3/52
主分类号
H04M3/52
代理机构
代理人
主权项
地址
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