Signs, luminous; backlit signs; digital signs; electric signs; electronic signs; electronic LED signs; illuminated exit signs; luminous signs; luminous variable/dynamic signs using light emitting diodes and electronic controllers to produce real-time and programmable messages and information displays; mechanical signs; electronic apparatus for remote control of signs; electronic sensors for detecting sounds; electronic sensors for detecting sounds, electric signs, and electronic apparatuses for remote control of the foregoing for security systems, all sold as a unit; electronic sensors for detecting sounds, electric signs, and electronic apparatuses for remote control of the foregoing for emergency evacuation systems, all sold as a unit
Electrical and Scientific ApparatusInstallation, maintenance, and repair of security systems; installation, maintenance, and repair of emergency evacuation systems; consulting services in the field of security system installation, maintenance, and repair; consulting services in the field of emergency evacuation system installation, maintenance, and repair
Building Construction and Repair