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BillJ said:
In the late 70's I had a garage door opener with a hard-coded freqency that was one of only five freqencies used by that manufacturer. A year after installation the door started opening and closing on its own. A neighbor had installed the same brand opener with the same freqency.
In the late 50's or early 60's one of the first satellites (Sputnik?) broadcast on the same frequency as certain brands of garage door opener, and every time it passed overhead, garage doors all across America opened (or closed).

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