The TI Datamath TI-2500 was still a good year or two from the concept stage. This provided a tactile feel that was important to early calculator users. The Klixon keyboard was used by Bowmar, the first US maker of pocket calculators, for their earliest models, including the 901B , 901D, MX55, etc, and the models they made for Craig and Commdore. In case you have trouble reading the text, we've duplicated it below. The face of the patented Klixon keyboard from Texas Instruments.
People love to touch it because they can hear it click.
And they can feel it click. Which is why the Klixon keyboard is used by more pocket calculator manufacturers than any other type. There are countless other applications. For your copy, fill out the coupon on the reverse side. Available in a choice of formats, allowing variations in the number and spacing of keys.