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经营范围
发明名称
Improvements in or relating to microphone units
摘要
申请公布号
GB805392(A)
申请公布日期
1958.12.03
申请号
GB19550010193
申请日期
1955.04.07
申请人
PROTONA PRODUKTIONSGESELLSCHAFT FUER ELEKTRO-AKUSTISCHE GERAETE G.M.B.H.
发明人
分类号
H04M1/65
主分类号
H04M1/65
代理机构
代理人
主权项
地址
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