History of Computing Science: The First Mechanical Calculator
Biography of Blaise Pascal, Inventor of the Calculator
Pascal's calculator (also known as the arithmetic machine or Pascaline), Stock Photo, Picture And Rights Managed Image. Pic. IAM-WHA_137_0913 | agefotostock
Pascal's calculator - Wikipedia
Blaise Pascal (1623 - 1662) - Biography - MacTutor History of Mathematics
Pascal's calculator | One of the first mechanical calculator… | Flickr