Parts for drones, robots, robotic devices, and unmanned aerial vehicles (UAVs); Electric propulsion system in the nature of electric motors for use in drones, robots, robotic devices, and unmanned aerial vehicles (UAVs); Engines and motors for drones, robots, robotic devices, and unmanned aerial vehicles (UAVs); Engines and motors; Aeronautical engines; Crank shafts for motors and engines; Crankcases for machines, motors and engines; Current generators; Cylinders for motors and engines; Engines, other than for land vehicles; Exhausts for motors and engines; Ignitions parts for internal combustion engines, namely, points; Injectors for engines; Mufflers for motors and engines; Piston rings; Pistons for engines; Starters for motors and engines; Robotic actuators for use in unmanned aerial vehicles, drones, robotic devices, and robots; Robotic joints being parts of machines; Mechanical actuators for robots, robotic devices, unmanned aerial vehicles, and drones; Industrial robots and robotic mechanisms; Machine parts, namely, gears, bearings, and housings for robots, robotic devices, unmanned aerial vehicles, and drones; Industrial robots; Robots and robotic arms