John Robertson wrote:
I have a small collection of those cardboard calculators that I got from
an electronics parts store I bought out:
https://www.flippers.com/images/prop...tors-front.JPG
https://www.flippers.com/images/prop...ators-rear.JPG
ITYM
https://www.flippers.com/images/Props/Cardboard_Calculators-front.JPG
and
https://www.flippers.com/images/Props/Cardboard_Calculators-rear.JPG