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发明名称
Mikrophon, bei welchem die Stromweglaenge nach Massgabe der Schallschwingungen der Membran verkuerzt oder verlaengert wird
摘要
申请公布号
DE492968(C)
申请公布日期
1930.03.04
申请号
DE1928R074491D
申请日期
1928.05.01
申请人
FRITZ RICHTER
发明人
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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