HFD means Harpies Feather Duster in Commercial
Similar to HFD
4WG - 4-pass Wet-back fire tube Boiler with Gun Burner4WN - Four-port Wall plate, Nylon
4WP - Four-legged Work Platform
4WP - Four-inch Wellpoint Pump
4WP - Series 4 Worm gear Power winch
4WP - Type 4 Water-Proof camera
4WT-B - Four Wire, Base mounted smoke detector with Thermal Detector
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