this post was submitted on 11 Dec 2023
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There were pipes for large houses back in the day for talking...
Edit* for Link https://lafayettesquarearchives.com/1892-speaking-tubes-and-old-homes/
Btw that seems pretty cool to have in the house, and the also furnace is always useful especially if you have many enemies
Something like that but with amplifiers to repeat over tens of kilometers