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发明名称
Telephone system
摘要
申请公布号
US1805778(A)
申请公布日期
1931.05.19
申请号
US19270171119
申请日期
1927.02.26
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
MERCER RICHARD
分类号
H04Q3/42
主分类号
H04Q3/42
代理机构
代理人
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地址
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