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发明名称
Sound radiator
摘要
申请公布号
US1970926(A)
申请公布日期
1934.08.21
申请号
US19330665548
申请日期
1933.04.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WENTE EDWARD C.
分类号
G10K11/02
主分类号
G10K11/02
代理机构
代理人
主权项
地址
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