1.   1202 Fibonacci's Liber Abaci.
   13×7 vs XIII • VII

    

    

2.   1614 Napier/Briggs Logarithms

    

   Revolutionalize the use of computers everywhere.

3.   1620? Napier/Oughtred Slide Rule.
   Pickett vs Sterling

    

4.   1640 Pascal The First Calculator

    

5.   1822/1832 First Computer: Babbage Difference/Analyical Engine

    

6.   1920's "computers" were still people.
   1960's my exposure to adding machines.
     1973 TI's SR-50 vs HP-45 with no =.
   

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