Control mechanisms for vehicles, namely, hydraulic circuits for vehicles, mechanisms for steering and changing transmission gears in vehicles, mechanical and hydraulic control mechanisms, mechanisms for controlling brakes, couplings and transmission components, namely, handle bar control levers for vehicles for all terrain vehicles and motorized vehicles including for [ walk behinds used in warehouses and plants, ] motorcycles, tricycles, scooters, automobiles, [ trucks, ] go-karts, trains, t...