Alarm, Signal and Security Detection
6310 Traffic and Transit Signal Systems
Excludes Railroad Signals.
6320 Shipboard Alarm and Signal Systems
6330 Railroad Signal and Warning Devices
Includes Railroad Gates; Flasher Lights;
Excludes Semaphore Flag Signals.
6340 Aircraft Alarm and Signal Systems
Includes Oxygen Pressure Signals and
Warning Devices; such as Air Pressure
Warning Signals, Aircraft Crew Warning
Signals, Altitude Warning Signals, Alarm
Controls, Audible Landing Gear Alarms.
Excludes Aircraft Engine Oil and Fuel
6350 Miscellaneous Alarm, Signal, and
Security Detection Systems
Includes Anti-intrusion Alarm Systems;
Foghorns; Gongs; Chimes; Bells; Burglar
Alarm Systems; Fire Alarms; Police
Manual Gas Alarms; Landing Wands.
Excludes Loran; Radar; Sonar; Engine
Oil and Fuel Warning Devices; Aircraft
Oxygen Warning Devices.