John Wolff's Web Museum - Slide Adding Machines

Mechanical Calculators

Christmas – John Johnson Collection: now and then

Math at the Met Scientific American

Moving towards vertically integrated artificial intelligence

Nice Vintage 1960's SWIFT HANDY CALCULATOR Desk Adding Machine

Marchant silent speed model D calculator. one part has a date of

The molecular cytoarchitecture of the adult mouse brain

References Smithsonian Institution

Western Carolina University Fine Art Museum Vitreograph Collection

Chuck Close Pace Gallery

John Wolff's Web Museum - Slide Adding Machines

Playskool MFG Co., est. 1928 - Made-in-Chicago Museum

John Wolff's Web Museum - Monroe