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发明名称
Apparatus for recording and reproducing electrical communication currents
摘要
申请公布号
US2592572(A)
申请公布日期
1952.04.15
申请号
US19460690985
申请日期
1946.08.16
申请人
JENNINGS MALBON H
发明人
JENNINGS MALBON H.
分类号
G11B7/00
主分类号
G11B7/00
代理机构
代理人
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地址
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