4W-B means Four Wire, Base mounted smoke detector in Commercial




Similar to 4W-B

ABN - Aluminum Brass Nickel
ABO - Alpha Boat Originals
ABPC - Alkyd Base Primer Coating
ABQR - Active Bio Quartz Ring
ABR - Abrasive Blasting and Restoration
ABS - Anti Balance System
ABS - Anti-Ballistic Selenium

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