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Sectors and precious mathematical and drawing instruments of the
Millionaire Calculating Machine National Museum of American History
John Wolff's Web Museum - Millionaire Register
National Museum of American History
The Millionaire (calculator) - Wikipedia
National Museum of American History
The Millionaire Calculating Machine, 1895
Breaking the Nazis' Enigma codes at Bletchley Park (photos) - CNET
Millionaire Calculating Machine