Category:Barbour Calculating Machine

Media in category "Barbour Calculating Machine"

The following 2 files are in this category, out of 2 total.

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  Barbour Calculating Machine patent model, 3rd version, probably by Edmund Dana Barbour, 1875, from the National Museum of American History - SIA-2006-804.jpg 3,180 × 2,027; 2.98 MB
  
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  Barbour Calculating Machine patent model, 3rd version, probably by Edmund Dana Barbour, 1875, from the National Museum of American History - SIA-2006-805.jpg 3,150 × 2,045; 2.37 MB