Ok, so let's imagine a scenario where you're living with someone (or maybe staying with someone for the weekend) in a very large house. You want to say something to the other person, but they're on the other side of the house. What do you do? You could yell, of course, but that requires a lot of exertion, and also there's the risk of being misunderstood. Nowadays, you would surely call or text them. In the past — we're talking way back in the '60s, before personal cell phones — there was another option. Some homes, mostly those of very wealthy people, had in-home intercom systems, so you could speak directly to people in other rooms just by pushing a button. Pretty neat.
from Apartment Therapy | Saving the world, one room at a time https://www.apartmenttherapy.com/home-intercom-system-history-257665
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