To do calculations using complex numbers.
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It looks like at Bell Labs (part of the phone company) in 1940. It looks like it was in New York City, from the article in the related link.
The introduction of the 1st mechanical calculator was invented in Europe. This type of calculator production then spread world wide. The first ever was invented by Willhelm Schickard.
The first adding calculator machine was invented by Blaise Pascal.
Most complex calculators have pi built into it. But you can use 3.14 if you only have a four function calc.
The first calculator was invented in 1623.