Electrically-powered motor scooters; Motor scooters and structural parts therefor; Motorized vehicles, namely, underwater diver propulsion vehicles; Motorized, electric-powered, self-propelled, self-balancing, wheeled personal mobility, transportation device; Non-motorized push scooters; Push scooters; Push scooters and structural parts therefor; Self-balancing unicycles; Water scooters; Wheels for scooters