PK

amplifiers; electrical anti-interference devices; burglar alarms; battery boxes and chargers; computers; computer programs for network communication; electrical control panels; electric converters; data processing apparatus; alternating current (A/C) motor speed controllers, boxes, consoles and machines; electric apparatus for the remote control of industrial operations; fire alarms; frequency meters; electric inverters; electrical surge protectors; electrical voltage meters; photovoltaic cells; electric plugs and electric sockets; printed circuits; radios; automatic voltage stabilizers; remote control apparatus; scales; solar batteries; sonars; switchboards; switchboxes; electric switches; thermostats; time switches; transformers; transmitters; voltage regulators for computers