Calculators: Casio Computer Company Ltd. (Japan)
Familiar Japanese calculator company that survived the price cutting of the 1970s and is still around today.  Who didn't own a Casio? Their distinctive designs are easy to recognise, the high quality still shows through. There is a very confusing numbering system with a "street name" and a code number - so both are listed when they used them.  Check out the early range of horizontal calculators - fine if you were right handed but I imagine difficult to use if you were left handed.    They also made branded calculators for the UK department store Boots and the American brand Sperry Remington.