c1920 Cased Fowler's Long Scale Circular Calculator : Parade Antiques Online Shop UK | Plymouth, Devon, All our finest items available to purchase worldwide
Fowler's Long Scale Calculator Circular Slide Rule | National Museum of American History
Fowler's Long Scale
The Fowler Fowler's Magnum Long Scale Calculator & Leather Case | eBay
Fowler's twelve-ten calculator - MAAS Collection
c1920 Cased Fowler's Long Scale Circular Calculator : Parade Antiques Online Shop UK | Plymouth, Devon, All our finest items available to purchase worldwide
File:Fowler's Magnum Long Scale Calculator - Ridai Museum of Modern Science, Tokyo - DSC07485.JPG - Wikimedia Commons
The Fowler Fowler's Magnum Long Scale Calculator & Leather Case | eBay