Chestnut Ridge Typewriter Museum (home page)

The Adder (10 key)
Austin adding machine (Double glass side panels)
Austin adding machine (Single glass side panel)
Ellis Adding-Typewriting Machine (Glass sides)
J L Herring (Webb variation) Adder
Ray Subtracto-Adder with desktop stand
Hauff "Optima" Double Disk
Standard Model B adding machine (Glass sides)