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21/08/1888 William Seward Burroughs invents mechanical calculator

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The Calculator: Where did it come from? | Stuff of Genius

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Burroughs Adding Machine History

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Burroughs Class 3 Adding Machine Review / HowTo

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Dead Tech Review: Burroughs Key-Operated Adding Machine

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Burroughs Adding Machine Circa 1903

Burroughs developed his adding machine to ease the monotony of clerical work. One year after making his first patent application Burroughs incorporated his business. Adding machines such as his were ubiquitous office equipment until they were phased out in favour of electronic calculators and later personal computers.
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