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发明名称
Telephone system
摘要
申请公布号
US1763901(A)
申请公布日期
1930.06.17
申请号
US19260148120
申请日期
1926.11.13
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
OSTLINE JOHN ELLIS
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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地址
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