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Heating, ventilation and air conditioning (HVAC) consultants
Engineering consultants, fibre optics applications
Telephone installation design and development consultants
Telephone answering machines
Hotel communication systems, complete
Telephone intercommunication equipment, industrial
Telephone intercommunication equipment, loudspeaker type
Telephone intercommunication equipment, push-button types
Telephone intercommunication equipment, direct speech
Measurement and regulation equipment and instruments - output and flow
Measurement and regulation equipment and instruments - pressure
Measurement equipment and instruments - position and distance
Electronic article surveillance (EAS) systems, acousto-magnetic
Electronic article surveillance (EAS) systems, electromagnetic
Electronic article surveillance (EAS) systems, radio frequency (RF)
Patient-to-nurse call systems, hospital
Warden call systems for old peoples homes
Signalling equipment for firing ranges
Signalling discs, police
Warning devices, emergency, voice synthesis
