Electric battery and accumulators; electronic agendas; fire, smoke, or anti-intrusion alarms; amplifiers; antennas; bar code reader; electric cables; optic fiber cables; calculating machine; magnetic encoded debit or credit card; cassette players; commutators; audio-visual compact discs featuring movies and music; blank read-only memory compact discs; computer game programs; computer memories; computers; printers for use with computers; electric contacts; electricity control panels; magnetic ...