Security alarm system means a device or series of devices, intended to summon law enforcement personnel during, or as a result of, an alarm condition. Devices may include hard- wired systems and systems interconnected with a radio frequency method such as cellular or private radio signals that emit or transmit a remote or local audible, visual, or electronic signal; motion detectors, pressure switches, duress alarms (a silent system signal generated by the entry of a designated code into the arming station to indicate that the user is disarming under duress); panic alarms (an audible system signal to indicate an emergency situation); and hold-up alarms (a silent system signal to indicate that a robbery is in progress).
Electronic security technician means a natural person who installs, services, maintains or repairs
air traffic control service means a service provided for the purpose of:
Air pollution control equipment means a mechanism, device, or contrivance used to control or prevent air pollution, that is not, aside from air pollution control laws and administrative regulations, vital to production of the normal product of the source or to its normal operation.
Agricultural equipment includes but is not limited to tractors; trailers; combines; tillage, planting, and cultivating implements; balers; irrigation implements; and all-terrain vehicles.