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发明名称
Ten key differential entry mechanism
摘要
申请公布号
US2608346(A)
申请公布日期
1952.08.26
申请号
US19460676677
申请日期
1946.06.14
申请人
FRIDEN CALCULATING MACHINE CO., INC.
发明人
HOPKINS GEORGE W.
分类号
G06F3/023
主分类号
G06F3/023
代理机构
代理人
主权项
地址
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