| http://www.w3.org/ns/prov#value | - A system as defined in claim 1 wherein said body is a sheet of said electrical insulating material, said plates comprise spaced metal foils on different portions of one face of said sheet and said coil comprises a spiral foil coil portion surrounding each of said metal foil plates on said one face of said sheet, said sheet being folded upon itself to bring said different portions of said one face,
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