File:Vintage Casio Memory-8A Electronic Pocket Calculator (aka Model CD-813), Green Fluorescent Display, Made In Japan, Circa 1974 (14189459971).jpg - Wikimedia Commons
File:Vintage Casio Memory 8R (aka Y-811) LED Handheld Electronic Calculator, Made in Japan, Circa 1973 (8714236526).jpg - Wikimedia Commons
Casio Memory-8A Handheld Electronic Calculator - Model CD-813 | National Museum of American History