HDM means Helium Distribution Manifold in
Commercial
Similar to HDM
4WT-B - Four Wire, Base mounted smoke detector with Thermal Detector
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
View all in Commercial