What's the oldest piece of tech you still have running?

And tell me how proud of it you are.

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I have a General Post Office model 711 telephone. I installed a microcontroller into it and it's now the keypad for my home alarm system. It's also hooked into Home Assistant so I could have it for other things if I wanted.
- That is just brilliant!
  
  Thanks. It has occurred to me to add a voice assistant to the phone as well but I'm not sure I'd ever actually use it.

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