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发明名称
Telephone system
摘要
申请公布号
US1752498(A)
申请公布日期
1930.04.01
申请号
US19270193242
申请日期
1927.05.21
申请人
WESTERN ELECTRIC COMPANY, INCORPORATED
发明人
MATHES ROBERT C.
分类号
H04M1/03
主分类号
H04M1/03
代理机构
代理人
主权项
地址
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