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发明名称
RATIO AND PROPORTION CALCULATOR
摘要
申请公布号
US3529135(A)
申请公布日期
1970.09.15
申请号
USD3529135
申请日期
1968.10.23
申请人
ROBERT L. RIENECKER
发明人
ROBERT L. RIENECKER
分类号
G06G3/00;(IPC1-7):G06C27/00;G01D13/02
主分类号
G06G3/00
代理机构
代理人
主权项
地址
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