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Hi there. I'm Gravis, proprietor of the Cathode Ray Dude youtube channel, through which I publish essays about old technology.

This wiki is a tool I've decided to start using to organize my research data. I claw through an enormous amount of Stuff on my way to reaching conclusions, and it's gotten hard to keep track of what I've found and how it relates to everything else. I hope to use this to make more sense of it all, and I figure I might as well make the results public.

Topics

Gadgets

Cash registers / point of sale

Early cash registers

Early electronic cash registers