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经营范围
发明名称
Resistance varying material
摘要
申请公布号
US1973703(A)
申请公布日期
1934.09.18
申请号
US19310574344
申请日期
1931.11.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GOUCHER FREDERICK S.;CHRISTENSEN CARL J.
分类号
H04R21/00
主分类号
H04R21/00
代理机构
代理人
主权项
地址
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