37 Installation, maintenance and repair of fire detection and suppression systems, fire alarms, fire extinguishers, sprinklers and related systems, namely, emergency lighting systems, license plate recognition systems, commercial and residential security systems, burglar alarms, access control systems, home surveillance systems, doorbell cameras, door lock controls, garage door controls, lighting controls, HVAC controls, appliance controls, home and office automation devices and other home and office monitoring and control applications; inspection and repair of backflow preventer systems