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经营范围
发明名称
Mathematical device
摘要
申请公布号
US2269975(A)
申请公布日期
1942.01.13
申请号
US19410391157
申请日期
1941.04.30
申请人
WINDSOR H. ATWATER;ROBERT MORRIS PIERCE
发明人
HUTTON WILLIAM G.
分类号
G06G3/06
主分类号
G06G3/06
代理机构
代理人
主权项
地址
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