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Mechanical Calculating Aids
Mechanical calculator - Wikipedia
Origin of Modern Calculating Machines, by J. A. V. Turck—A Project
Did computers really start out to be huge calculators? - Quora
Slide Rules & Calculators — The National Museum of Computing
Wesleyan's Observatory To Celebrate 100th Anniversary – Hartford
US needs monuments celebrating African American history, not
the Millionaire Calculating Machine, 1918
National Museum of American History
Edmund Dana Barbour - History-Computer
John Wolff's Web Museum - Millionaire Register
Mystery Dating of the World-famous 'Millionaire' Calculating
John Wolff's Web Museum - Millionaire Register