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发明名称
Aid to price estimation
摘要
申请公布号
US2217881(A)
申请公布日期
1940.10.15
申请号
US19320593773
申请日期
1932.02.18
申请人
TECHNIGRAPH, INC.
发明人
ALLEN JOHN C.
分类号
H04L12/18
主分类号
H04L12/18
代理机构
代理人
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地址
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