Transmitters of electronic signals; transponders; electro-dynamic apparatus for the remote control of signals; locks, electric; smoke detectors; fire alarms; wearable activity trackers; baby monitors; electric door bells; telecommunication transmitters; rods for water diviners; electric plugs; electrical inductors; infrared detectors; electronic access control systems for interlocking doors; audio- and video-receivers; cabinets for loudspeakers