There's a decent fan/reference/info page for these [1] on vcalc,net. edit to add, also a decent Wikipedia page [2]. [1] https://www.vcalc.net/cu.htm https://ww

There's a decent fan/reference/info page for these [1] on vcalc,net. edit to add, also a decent Wikipedia page [2]. [1] https://www.vcalc.net/cu.htm https://www.vcalc.net/cu.htm [2] https://en.wikipedia.org/wiki/Curta https://en.wikipedia.org/wiki/Curta