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发明名称
Telephone system
摘要
申请公布号
US1837801(A)
申请公布日期
1931.12.22
申请号
US19280320826
申请日期
1928.11.21
申请人
ASSOCIATED TELEPHONE AND TELEGRAPH COMPANY
发明人
VICK WILLIAM STANLEY;TURTON GEORGE DEAN
分类号
H04Q3/00
主分类号
H04Q3/00
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代理人
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