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发明名称
Intercommunicating system
摘要
申请公布号
US2451339(A)
申请公布日期
1948.10.12
申请号
US19450576787
申请日期
1945.02.08
申请人
AUTOMATIC ELECTRIC LABORATORIES, INC.
发明人
HERRICK ROSWELL H.
分类号
H04M9/00
主分类号
H04M9/00
代理机构
代理人
主权项
地址
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