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发明名称
Phonographic stylus
摘要
申请公布号
US2418212(A)
申请公布日期
1947.04.01
申请号
US19430493387
申请日期
1943.07.03
申请人
WILLIAMSON FRED E
发明人
WILLIAMSON FRED E.
分类号
主分类号
代理机构
代理人
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