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发明名称
Magnetic telegraphone
摘要
申请公布号
US2235132(A)
申请公布日期
1941.03.18
申请号
US19390287192
申请日期
1939.07.29
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
WOOLDRIDGE DEAN E.
分类号
G11B5/03
主分类号
G11B5/03
代理机构
代理人
主权项
地址
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