My Dad sold the earliest electronic calculators made by Sony Business Equipment. They were about half again as big as a CPA style mechanical calculator. The first thing I did was divide one by zero. Every digit element of every number in the NIXIE tube display lit up and required a Clear All keystroke to restart. When my Dad went to the regional office he showed it to the techs who decided it was a great way to test the display.The standard Sony calculator cost $500 with a one number memory add a square root key for $100. Sold like hotcakes for a few years till the first pocket sized calculators appeared. Sony gave up on that market almost immediately.
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