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发明名称
Automatic telephone system
摘要
申请公布号
US1811753(A)
申请公布日期
1931.06.23
申请号
US19280321353
申请日期
1928.11.23
申请人
RESERVE HOLDING COMPANY
发明人
HOVLAND OLE C.
分类号
H04Q1/04
主分类号
H04Q1/04
代理机构
代理人
主权项
地址
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