i know that even then the shielding would prevent that wavelength.. but another part of me would be terrified of a refrigerator sized microwave built in the 60s
I was gonna say, I highly doubt there was a microwave oven in the entire city in the 60s.
And you weren't kidding!
1946: The RadaRange, the first commercial microwave, was sold to restaurants, ship galleys and canteens. This six feet tall, 750 pound microwave sold for around $5,000. ($80,846 today.)
1955: Tappan made the first residential microwave, which was rarely seen in homes due to its staggering size and $1,300 price tag. ($15,294 in 2024 bucks.)
I know you guys probably already know this, but just to make it clear- just because the building was built in the 60s doesn't mean they couldn't have gotten a microwave and added a sign later :p