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发明名称
Telephone supervisory system
摘要
申请公布号
US1793812(A)
申请公布日期
1931.02.24
申请号
US19280280433
申请日期
1928.05.25
申请人
RESERVE HOLDING COMPANY
发明人
LOMAX CLARENCE E.
分类号
H04Q1/26
主分类号
H04Q1/26
代理机构
代理人
主权项
地址
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