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经营范围
发明名称
Ribbon-type microphone diaphragm
摘要
申请公布号
US2608265(A)
申请公布日期
1952.08.26
申请号
US19490096012
申请日期
1949.05.28
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ECKARDT HELMUTH
分类号
H04R9/08
主分类号
H04R9/08
代理机构
代理人
主权项
地址
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