#USPTO: 15.01.04 - Valves, automobile engine, Motors, outboard (boat), Air cleaner filters, automotive, Alternators, Boat motors, outboards, Carburetors, vehicle, Diesel engines, Engines, combustion, Engines, steam, Engines, turbine, Filters, air cleaner (automotive), Filters, oil (automotive), Motors (machinery), Internal combustion engines, Generators #Ein Pfeil #USPTO: 24.15.10 - More than one arrow, Arrows, more than one #USPTO: 26.01.02 - Plain single line circles, Circles, plain single line #USPTO: 26.01.09 - Circles having objects as a border, Circles having animals as a border, Circles having plants as a border, Circles having geometric figures as a border, Circles having humans as a border, Geometric figures, objects, humans, plants or animals forming or bordering the perimeter of a circle.