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发明名称
Intercommunication system
摘要
申请公布号
US2383832(A)
申请公布日期
1945.08.28
申请号
US19430474013
申请日期
1943.01.29
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
WILLIAMS ALFRED L. W.
分类号
H04R17/00
主分类号
H04R17/00
代理机构
代理人
主权项
地址
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