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发明名称
Telephone unit
摘要
申请公布号
US2100500(A)
申请公布日期
1937.11.30
申请号
US19340738030
申请日期
1934.08.02
申请人
ASSOCIATED ELECTRIC LABORATORIES, INC.
发明人
WOODRUFF ALBERT E.;SENGEBUSCH HANS
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
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