- Surviving Pascalines
- Exemplar and Replica Pascalines
- O.J. Adder Instructions for Use
- Operating Instructions For A Pascaline
- Article in La Nature, 1893 on the Centigraph
- Old Babylonian Tag Notes
- Diderot and D’Alembert 1759 - Mechanism of the Pascaline
- Pascaline Mechanism
- Bloch Schnellkalulators In Collections
- Fakes And False Promises
- Catalogue Amendment By Auction Team Breker
- Original Spalding Adding Machine Patent - US Patent 146407
- Extracts from Kepler’s Letters
- Herzstark Electric Mechanism