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发明名称
符号算盘
摘要
本实用新型在算盘上,安设一个横轴,轴上安装负数符号,小数符号,数的隔离符号之装置。三种符号设备,以手在横轴上游动,用于珠算带符号计算。本实用新型结构特别简单;安装计算符号,为中小学生提供简便算具;“手是表现于外的脑”,让学生勤打算盘做作业,手脑并用,开发脑力,提高工效,节省稿纸。
申请公布号
CN2055956U
申请公布日期
1990.04.11
申请号
CN89215808.5
申请日期
1989.08.24
申请人
金嗣道;王紫繁
发明人
金嗣道;王紫繁;金涛
分类号
G06C1/00
主分类号
G06C1/00
代理机构
代理人
主权项
1、在算盘上设置计算符号装置,该装置上有一个横轴(1),轴上安装负数符号(2),小数符号(3),数的隔离符号(4),其特征在于:横轴固定于梁上,它可磁化或不磁化,轴上安装计算符号,计算时用手在横轴上游动符号装置,使珠算具有符号演算。
地址
天津市王串场真理道铁道部电化局电化院
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