Abstract: This invention displays a screen simulating a pen drawing measured data on a recording paper when displaying the measured data on the screen.For this purpose, this invention displays the measured data on the screen by composing the content in a video memory holding the screen information similar to a recording paper and the content in a data memory storing the measured data.

Abstract: A multiple position recorder having mechanisms for rocking a check lever for preventing a dot print wheel or dot and figure print wheels from lowering which is mechanically constructed while the recorders other mechanisms, such as mechanisms for setting the gap of dot printing and figure printing, mechanisms for synchronization with a driving shaft and the like are constructed by electric circuits.

Abstract: A changeover switch comprising first and second substrates assembled in spaced relation to each other, a plurality of reed switches disposed in a circle having predetermined angular intervals on the substrates, a permanent magnet pivotally mounted on a revolving disc so as to lie in the same plane as the first and second substrates for causing the reed switches to switch on and off alternately as it is revolved between the first and second substrates, and a means for intermittently rotating the permanent magnet at an angle of every 90.degree. around its pivotal axis.