The first “electronic calculator” I saw was about the size of an electric type writer - would have been around ‘71.Was not him though?
The Japanese started churning them out in the early to mid 70's.
Could be Sir Clive made them "affordable" & importantly "pocket sized" I think. Huge leap forward.
I recall my boss going totally ape at his son ( a director as well) for blowing what was to me around 8 or 9 times my take home wage to buy a Sanyo / Sony / Sharp maybe...long time ago now. I think it doubled as a cash register you could link to a till roll.
That was the era of the 1st so called "credit card"...the Access...when shops had to call Access Central to pass the purchases.
I think...calcs were a known quantity under development in the USA in the late 60s.
One of the guys in the office came up with a calculation that he would put in as we went to lunch and it would still be churning away when we got back from the pub an hour later.