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发明名称
Toll trunking system
摘要
申请公布号
US1792452(A)
申请公布日期
1931.02.10
申请号
US19280250232
申请日期
1928.01.28
申请人
RESERVE HOLDING COMPANY
发明人
THARP VICTOR S.;CROCKER THOMAS F.
分类号
H04M3/60
主分类号
H04M3/60
代理机构
代理人
主权项
地址
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