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发明名称
玻璃黑板上绘圆的圆规
摘要
在玻璃黑板上绘圆的圆规,是采用吸盘式,能根据需要随意将圆心固定在黑板上,克服了旧式两脚圆规难以固定圆心的弊病,从而避免了损伤黑板。并能精确地根据需要调整半径。整个圆规均采用塑料,成本低廉,便于推广。
申请公布号
CN85204880U
申请公布日期
1987.10.03
申请号
CN85204880
申请日期
1985.12.10
申请人
吕怀瑾
发明人
吕怀瑾
分类号
B43L9/02;G09B11/00
主分类号
B43L9/02
代理机构
代理人
主权项
1、一种能够在玻璃黑板上绘圆的圆规,其特征是由吸盘、滑尺、粉笔夹三部分组成。吸盘用来将圆心固定在黑板上,滑尺上的刻度可根据半径的大小调整粉笔夹与吸盘间的距离。
地址
山西省太原市太原工业大学电力分院
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