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经营范围
发明名称
Balanced granular microphone
摘要
申请公布号
US2435920(A)
申请公布日期
1948.02.10
申请号
US19430503093
申请日期
1943.09.20
申请人
ELECTRO-VOICE MANUFACTURING CO., INC.
发明人
BURROUGHS LOUIS R.
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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