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John Wolff's Web Museum - Slide Adding Machines

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Crowned Plague – The Brooklyn Rail

References, Page 5

Marchant Figurematic

Dark Roasted Blend: Awesome Vintage Calculators

september 2011 update - John Neal, Bookseller

August Sander People of the 20th century – Art Blart _ art and

Moving towards vertically integrated artificial intelligence

Christmas – John Johnson Collection: now and then

National Museum of American History

2009 Pittcon Final Program - Pittcon Web Archives

Retrotechtacular: The CURTA Mechanical Calculator

Math at the Met Scientific American

Context: Belfast: Harland & Wolff - Shipbuilding Yard. RMS Olympic

Technology just makes us all busier, Jonathan Wolff