Dual alloy rotor
Dual alloy turbine blade
Dual alloy turbine disk
Dual counterweight balancing system
Dual cut-back trailing edge for airfoils
Dual flow impeller
Dual fluid rotor apparatus
Dual fold tail vane assembly for wind energy systems
Dual intensity peening and aluminum-bronze wear coating...
Dual mounting ceiling fan
Dual positionable oscillating fan
Dual rate torque transmitting device for a marine propeller
Dual structure turbine blade
Dual trunnion hub-to-mast assembly
Dual-plane blade construction for horizontal axis wind turbine r
Ducted Anti-torque rotor with floating blades
Ducted fan and pitch controls for tail rotor of rotary wing airc
Ducted tail rotor for rotor craft
Ducted tail rotor providing torque reaction and yaw attitude con
Ducted turbine