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发明名称
Optical objective system for sound recording
摘要
申请公布号
US2508892(A)
申请公布日期
1950.05.23
申请号
US19470769239
申请日期
1947.08.18
申请人
RADIO CORPORATION
发明人
SACHTLEBEN LAWRENCE T.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
主权项
地址
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