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发明名称
Sound reproducer
摘要
申请公布号
US1981793(A)
申请公布日期
1934.11.20
申请号
US19290402128
申请日期
1929.10.24
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
KELLER ARTHUR C.
分类号
H04R1/16;H04R9/12
主分类号
H04R1/16
代理机构
代理人
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地址
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