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发明名称
Ratio calculator
摘要
申请公布号
US2058280(A)
申请公布日期
1936.10.20
申请号
US19320611726
申请日期
1932.05.16
申请人
ERNEST WELLS ROY
发明人
WELLS ROY ERNEST
分类号
G06G1/00
主分类号
G06G1/00
代理机构
代理人
主权项
地址
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