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发明名称
万能直尺
摘要
本实用新型涉及一种万能直尺,属几何做图工具。它解决了普通直尺在做图时必须借量角器、三角板,以及在某些场合需用圆规等问题,其主要特征是在长条形的直尺上有双边刻度,一边是以尺中心为0点的对称距离刻度,另一边是以尺中心为90度角的角刻度。所以单用本尺便可做直线、做角,等分角时可不用圆规,在坐标系中做对称图形时又能节省时间,确是学生、教师及科研人员的必备工具。
申请公布号
CN2049603U
申请公布日期
1989.12.20
申请号
CN89200832.6
申请日期
1989.01.19
申请人
杜晶民;张爱昆;刘琦;李晓萍
发明人
杜晶民;张爱昆;刘琦;李晓萍
分类号
B43L7/00
主分类号
B43L7/00
代理机构
代理人
主权项
一种万能直尺,其特征是:在长条形直尺上有双边刻度,一边为以本边中点为O的对称距离刻度,另一边是以此边中点为90度角的角刻度。
地址
黑龙江省大庆市商业技校
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