The Slide Rule, Not Electronic Calculator, Brought Man to the Moon - Engineer Dee's Blog
Alco Personal Calculator (Simplex Slide Rule and Adder) | National Museum of American History
Slide rule hi-res stock photography and images - Alamy
A FULLER'S SPIRAL CYLINDRICAL SLIDE RULE CALCULATOR | History of Science and Technology, Including Fossils, Minerals and Meteorites | Books & Manuscripts | Sotheby's