Divide by Zero on the Friden STW10 Mechanical Calculator - YouTube
Friden EC-130 Electronic Calculator
The Friden STW-10 Calculator Plays The Friden March - YouTube
Tube Time (@tubetime@mastodon.social) on Twitter: "this is one of the world's first electronic calculators, the Friden EC-130, which came out in 1964! it's a really fascinating machine, so let's look at it
Friden Model 130 Desktop Electronic Calculator | National Museum of American History
Friden Model 1150 Desktop Electronic Calculator | National Museum of American History