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发明名称
Key board
摘要
申请公布号
US2116808(A)
申请公布日期
1938.05.10
申请号
US19370122750
申请日期
1937.01.28
申请人
WALBERG BERNARD E
发明人
WALBERG BERNARD E.
分类号
G10C3/12
主分类号
G10C3/12
代理机构
代理人
主权项
地址
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