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经营范围
发明名称
Electroacoustic transducer
摘要
申请公布号
US2520646(A)
申请公布日期
1950.08.29
申请号
US19480048433
申请日期
1948.09.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
MOTT EDWARD E.
分类号
H04R11/00
主分类号
H04R11/00
代理机构
代理人
主权项
地址
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