4WT-B means Four Wire, Base mounted smoke detector with Thermal Detector in
Commercial
Similar to 4WT-B
4WW - Four-Wheel Wagon
4WW - Water Wiggler Water Agitator, model 4
4WW - Four-Wheeled Walker
95 - version 4.0 of Microsoft Windows
98 - version 4.1 of Microsoft Windows
A/C - Air Conditioning
AA - Adjustable Arms
View all in Commercial