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经营范围
发明名称
Phonograph pickup
摘要
申请公布号
US2383994(A)
申请公布日期
1945.09.04
申请号
US19420444323
申请日期
1942.05.25
申请人
NATIONAL COMPANY, INC.
发明人
SMITH GRAYDON
分类号
H04R9/12
主分类号
H04R9/12
代理机构
代理人
主权项
地址
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