Electrical transformers; electric batteries; antennas; electric coils; holders for electric coils; electromagnetic coils; chargers for electric batteries; electric apparatus for commutation, namely, current converters; power inverters; chocking coils for use in electrical apparatus, namely, electric coils; magnetic cores; magnetic filaments, namely, magnetic coils; magnetic protectors, namely, magnetic contacts; magnetic filters, namely, magnetic encoders; magnetic sensors, namely, metal dete...