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发明名称
Telegraph code practice keyer
摘要
申请公布号
US2857460(A)
申请公布日期
1958.10.21
申请号
US19530394172
申请日期
1953.11.24
申请人
RUDOLF HELL;ALFRED SAMLOWSKI
发明人
HELL RUDOLF;SAMLOWSKI ALFRED
分类号
G09B19/26
主分类号
G09B19/26
代理机构
代理人
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