Accumulators; Acoustic alarms; Acoustic conduits; Acoustic couplers; Adapter cables for headphones; Adapter plugs; Adding machines; Aerial amplifiers; Aerial cables for heavy currents; Air traffic control radio equipment; Alarm central units; Alarm installations and alarms; Alarm sensors; Answering machines; Anti-intrusion alarms; Anti-reflective lenses; Antireflection coated eyeglasses; Apparatus and instruments for weighing; Apparatus and instruments for conveying, distributing, transformin...