World of Engineering on Twitter: "Historic invention of the day: 1970: The pocket calculator is invented in Japan. Image credit: Mister rf https://t.co/DOK6FZ76ta" / Twitter
Panasonic MISTER THIN FM-AM Portable Radio with Clock/Calculator RF-079 | eBay
Panasonic MISTER THIN FM-AM Portable Radio with Clock/Calculator RF-079 | eBay