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发明名称
Transducer
摘要
申请公布号
US2353089(A)
申请公布日期
1944.07.04
申请号
US19420436230
申请日期
1942.03.26
申请人
THE BRUSH DEVELOPMENT COMPANY
发明人
SHAPIRO HARRY B.
分类号
H04R17/00
主分类号
H04R17/00
代理机构
代理人
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