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经营范围
发明名称
Acoustic device
摘要
申请公布号
US2069817(A)
申请公布日期
1937.02.09
申请号
US19330691015
申请日期
1933.09.26
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
CLARKE HARRY R.
分类号
H04R13/02
主分类号
H04R13/02
代理机构
代理人
主权项
地址
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