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发明名称
Carbon microphone
摘要
申请公布号
US2302278(A)
申请公布日期
1942.11.17
申请号
US19410374054
申请日期
1941.01.11
申请人
JOHANNES VOORHOEVE NICOLAAS AN;WILLEM KNEVEL JAN
发明人
VOORHOEVE NICOLAAS ANTHONY JOHANNES;KNEVEL JAN WILLEM
分类号
H04R21/02
主分类号
H04R21/02
代理机构
代理人
主权项
地址
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