[ Switchboards; Intercommunication apparatus, namely, Telephones incorporating intercommunication systems; Optical communication equipment, namely, switches, and console, alarm, sensor and power management devices; Integrated circuits; Printed circuit boards; ] Stabilized voltage power supply; Low voltage power supply; Electric transformers; [ Electric control panels; ] electric light dimmers; [ Video screens; Wires, electric; Batteries, electric; ] Battery chargers; [ Radios; Materials for e...