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发明名称
Telephone system
摘要
申请公布号
US1895020(A)
申请公布日期
1933.01.24
申请号
US19310508980
申请日期
1931.01.15
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
BASCOM HENRY M.
分类号
H04M17/02
主分类号
H04M17/02
代理机构
代理人
主权项
地址
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