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发明名称
Recording unit
摘要
申请公布号
US2181940(A)
申请公布日期
1939.12.05
申请号
US19370175370
申请日期
1937.11.19
申请人
INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
FITCH CLYDE J.;SCHNEIDER KURT R.
分类号
H04L17/00
主分类号
H04L17/00
代理机构
代理人
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