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发明名称
Magnetic recording system
摘要
申请公布号
US2790645(A)
申请公布日期
1957.04.30
申请号
US19510221658
申请日期
1951.04.18
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
BUHRENDORF FREDERICK G.
分类号
H04M15/04
主分类号
H04M15/04
代理机构
代理人
主权项
地址
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