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simpleintheory
79 days ago
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Batteries Not Included, or Required, for These Sma...
Are you sure it wasn’t one of these?
https://en.wikipedia.org/wiki/The_Mosquito
dn3500
79 days ago
[–]
Yes. This was more than 50 years ago. The store owner let me examine the device. It was wired into his alarm system. It even had the frequency listed on the label.
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