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发明名称
Telephone system
摘要
申请公布号
US2224701(A)
申请公布日期
1940.12.10
申请号
US19370175822
申请日期
1937.11.22
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
SAVILLE WILLIE;WILLIAMS AUSTIN HUGH
分类号
H04Q1/36
主分类号
H04Q1/36
代理机构
代理人
主权项
地址
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