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发明名称
Automatic toll-service trunking system
摘要
申请公布号
US1786041(A)
申请公布日期
1930.12.23
申请号
US19270225063
申请日期
1927.10.10
申请人
RESERVE HOLDING COMPANY
发明人
THARP VICTOR S.;WICKS JOHN
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
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