Copyright © 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking. We're replacing BBC Sounds outside ...
Copyright © 2025 BBC. The BBC is not responsible for the content of external sites. Read about our approach to external linking. We're replacing BBC Sounds outside ...
The box looked like a relay, and it contained a radio. It was a Funkrundsteueremfänger – a radio controlled power controller – made by a company called EFR. It turns out that these boxes are ...
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