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    • 1. 发明授权
    • Apparatus for forming and displaying words or numerals or a series of numerals and symbols
    • 用于形成和显示字或数字的装置或一系列数字和符号
    • US3757433A
    • 1973-09-11
    • US3757433D
    • 1971-10-18
    • ROBINSON JHIBBERT F
    • ROBINSON JHIBBERT F
    • G09B1/28
    • G09B1/28
    • Apparatus for displaying letters, numerals and symbols for teaching educational subjects comprising a frame formed in two substantially identical sections mounted one above the other and formed with a plurality of parallel longitudinal slots in one half of each section, identical columns of letters, numerals and symbols being inscribed on the lands between the slots, and slider strips mounted to slide between the sections in the slots movement of each strip bringing the letters, numeral or symbol selected on one section into a transverse window slot in the frame to enable, by the selection of the required letters, numerals or symbols, words, sentences or mathematical expressions to be displayed in the window slot, the ends of the strips remote from the selected letter, numeral or symbol sliding into the end of the frame remote from the longitudinal slots.
    • 用于显示用于教授教育对象的字母,数字和符号的装置,包括形成在两个基本上相同的部分中的框架,该两个基本上相同的部分彼此并排安装,并且在每个部分的一半中形成有多个平行的纵向狭槽,相同的字母,数字和符号 被刻在槽之间的平台上,以及滑动条,其安装成在每个条带的狭槽运动中的部分之间滑动,使得在一个部分上选择的字母,数字或符号进入框架中的横向窗口槽,以便通过选择 要在窗口中显示的所需字母,数字或符号,单词,句子或数学表达式,远离所选字母的条带的端部,数字或符号滑入框架远离纵向槽的端部。