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OK what we can see is the germanium substrate and a rather primitive contact screw sealed into a plexiglas housing. The coils seem not to be handmade. They're more looking like solenoids from 230VAC AC relays. This could be a hint that an exact specification of the coils is not crucial. Everything is fixed with a kind of silicon glue in the housing. I still have doubts about the efficacy of the coils. They might work as pick-up coils for interference or magnetic induction or they might do nothing at all.

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