An 8-tube module from a 1954 IBM mainframe examined: it's a key debouncer
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MANIAC-II, Vacuum Tube Computer, 1957 - Stock Image - C044/8530 - Science Photo Library
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The Colossus vacuum tube computer ...
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Computer history cheatsheet: from vacuum tubes to smartphones | pnote.eu
A first generation tube calculator: BULL GAMMA 3 - technikum29
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