Drum winches
Dual actuator mechanical switch
Dual capstan puller and method
Dual control system for cranes
Dual drive system for dragline with power interlock
Dual extensible reach truck
Dual hose reel
Dual hydraulic lifts
Dual output gear motor
Dual ramp cam actuator
Dual weight assembly for a crane
Dual-drive winch system adapted for well logging applications
Dual-motor a.c. drive for automatic hoists
Dumbwaiter door
Dump block for dragline bucket
Dunnage clamp for forklift trucks
Duplex driving system for an electrically-operated moving...
Dust collecting bag
Dynamic assignment switching in the dispatching of elevator...
Dynamic braking of electric hoist motors