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发明名称
Calculator sign control circuit
摘要
申请公布号
US2679977(A)
申请公布日期
1954.06.01
申请号
US19460716762
申请日期
1946.12.17
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
ANDREWS ERNEST G.
分类号
G06F7/44
主分类号
G06F7/44
代理机构
代理人
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地址
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