This is a chart and a heptagram scheme of compatible and incompatible conductors of 7 types.
electronic
electronics
conductors
Comments
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P.S. I would assign the signs to the elements much differently.
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Darn, I was distracted when this was on FP and neglected it. Now, on a second look, I see the astrological relationships. There's food for thought. Anyway, a belated +1