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发明名称
Automatic intercommunicating system
摘要
申请公布号
US2076176(A)
申请公布日期
1937.04.06
申请号
US19330683005
申请日期
1933.07.31
申请人
DAVIDSON WILLIAM F
发明人
DAVIDSON WILLIAM F.
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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