Flight simulators; flight simulators for aircraft; flight simulators for space vehicles; gunnery training simulator apparatus; image making devices for simulators; instrumentation simulators; medical simulators (teaching aids); simulators; simulators for leisure installations; simulators for simulating the operation of aircraft; simulators for simulating the operation of land vehicles; simulators for simulating the operation of motor vehicles; simulators for simulating the operation of space vehicles; simulators for simulating the operation of watercraft; simulators for the steering and control of vehicles; simulators for training personnel in the driving of vehicles; simulators for training personnel in the flying of aircraft; simulators for training personnel in the flying of space vehicles; simulators for training personnel in the ground control of aircraft; simulators for training personnel in the operation of aircraft; simulators for training personnel in the operation of land vehicles; simulators for training personnel in the operation of motor vehicles; simulators for training personnel in the operation of space vehicles; simulators for training personnel in the operation of watercraft; simulators incorporating digital computers for industrial training purposes; training simulators for civil aviation purposes