LIQUID/LIQUID, LIQUID/GAS OR GAS/GAS SEPARATION Method General operations by centrifugal force, using centrifuges or free-vortex apparatus using magnetic or electrostatic effect Apparatus General operations by centrifugal force, using centrifuges or free-vortex apparatus , using magnetic or electrostatic effect SOLID/LIQUID OR SOLID/GAS SEPARATION Method General operations by centrifugal force using centrifuges or free-vortex apparatus using magnetic or electrostatic effect Apparatus General operations by centrifugal force using centrifuges or free-vortex apparatus , using magnetic or electrostatic effect SOLID/SOLID SEPARATION Method Dry methods material in bulk Individual sorting Screening, sifting, pneumatic sorting using pneumatic tables or jigs by magnetic or electrostatic effect by centrifugal force using centrifuges or free-vortex apparatus Wet methods General operations flotation, differential sedimentation screening Combinations Dry methods - wet methods Apparatus Dry methods material in bulk Individual sorting Screening, sifting, pneumatic sorting using pneumatic tables or jigs by magnetic or electrostatic effect by centrifugal force using centrifuges or free-vortex apparatus , Wet methods General operations flotation, differential sedimentation screening Combinations Dry methods - wet methods In this class, the following term is used with the meaning indicated: "vehicle" means all vehicles except those restricted to one of the following types of vehicles: rail vehicles, waterborne vessels, aircraft, space vehicles, hand carts, cycles, animal-drawn vehicles, and sledges, which are covered by the relevant subclasses of . Thus the term "vehicle" includes: vehicular characteristics which are common to more than one of the above-listed types; certain characteristics restricted to automobiles, road or cross-country trailers. The following exceptions to the above should be noted: subclass or embrace all vehicle wheels and tyres, except wheels for roller skates , wheels for model railway vehicles , and special adaptations of wheels or tyres for aircraft ; subclass embraces the connection of valves to inflatable elastic bodies in general, and in this respect it is not limited to vehicles; subclass embraces certain electric equipment of all electrically-propelled vehicles; subclass embraces certain power supply equipment for, but external to, any kind of electrically-propelled vehicle; subclass embraces safety belts or body harnesses used in all types of land vehicles; subclass relates to all kinds of vehicles, except the servicing of rail locomotives , ground equipment for aircraft , or cleaning apparatus peculiar to waterborne vessels , ; subclass includes brake control systems of general applicability, and in this respect it is not limited to vehicles. It also includes rail-vehicle power-brake systems and some other features of rail-vehicle brake systems. In this subclass, the following terms or expressions are used with the meanings indicated: "auxiliary drives" means drives of auxiliary or external machines or devices from the propulsion unit, transmission, or other parts of the vehicle, and includes the control of such drives; "transmission" means all propulsion parts linking propulsion units, e.g. engines, to ultimate propulsive elements, e.g. wheels. Attention is drawn to the Note following the title of class . ARRANGEMENTS OF PROPULSION UNITS Electric; steam or gas; internal-combustion or jet-propulsion; plural diverse prime-movers ; ; ; Motor incorporated in, or adjacent to, traction wheel Other kinds Arrangements of control devices Safety devices ARRANGEMENT OF TRANSMISSIONS OR OF THEIR CONTROL DEVICES , ARRANGEMENT OF CHANGE-SPEED GEARING CONTROL DEVICES ARRANGEMENT IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST, OR FUEL SUPPLY, OF PROPULSION UNITS , , ARRANGEMENTS IN CONNECTION WITH POWER SUPPLY FROM FORCE OF NATURE AUXILIARY DRIVES KINDS OF CONTROL Fittings for automatically controlling vehicle speed INSTRUMENTATION, DASHBOARDS , In this group, the following expressions are used, with the meaning indicated: "prime-mover" means a propulsion unit or source of motive power providing a mechanical output, e.g. via a rotating shaft; "hybrid electric vehicle" [HEV] means a vehicle having an electric prime-mover and a combustion engine, in which the electrical prime-mover and the combustion engine either singly or in combination, drive the ultimate propulsive elements, e.g. wheels; "energy storing means" means apparatus for storing propulsiveenergy and providing stored energy to drive the prime-mover or the ultimate propulsive elements, e.g. wheels; "motor-generator" means an electric machine, such as a motor or a generator, or a mechanical combination thereof, which can provide positive mechanical output force or torque and which can function at other times as an electric generator. When classifying in one of groups , or , further technical information, which is considered to represent information of interest for search, should also be classified in the other subgroups of main group to enable searching using a combination of classification symbols. In this group: the means ordinarily includes a device, e.g. a servomechanism, for operating a velocity-affecting element of the vehicle, e.g. the throttle; a means for preventing a vehicle from exceeding a particular speed is often referred to as a "governor", whereas a means for maintaining the vehicle within a relatively narrow speed range is generally designated as "speed control". Since these two functions are frequently interrelated, no attempt has been made to identify such means as being particularly adapted to perform only one, or the other of the functions. This subgroup covers also, for example, the pendulum of a curve compensator, i.e. a refinement to the regulating means for automatically adjusting the "set" speed of the means to changes in the course of the roadway along which the vehicle is travelling. In this subgroup, rotating weights driven at a speed proportional to that of the vehicle's motor presently predominate.