Lines with other classes and within this class(1) This class is subordinate to Class 280, Land Vehicles, and distinguishes therefrom by the above definition. (2) This class is subordinate to Class 180, Motor Vehicles. The broader or more comprehensive combinations of cooperating structure of a wheel and axle with other elements of a motor-vehicle are classified in Class 180. Such cooperating structure on the wheel and axle is found in this class (301) only where its modification is for wheel and axle structure purposes alone. (3) The combination of a detailed wheel with a detailed brake is found in Class 301. A brake with only enough wheel structure to support the brake is found in Class 188, Brakes. (4) A wheel or the combination of a wheel with a resilient tire or with a resilient wheel component is normally found in Class 301. A resilient tire, a resilient wheel, or a resilient wheel component is found in Class 152. For example, a resilient tire with a rim including details of the rim allowing the tire to be seated thereon is found in Class 152, but it is found in Class 301 if further including mounting structure for supporting that structure on a bearing hub. A traction-increasing device supported by a wheel, even though combined with a resilient tire, is found in Class 301, but another traction-increasing device operative to engage the tread of the tire and permit resilient operation thereof is found in Class 152. (5) A device which functions as a transportation means for a vehicle, but which is not a true wheel, is found in Class 180, Motor Vehicles, subclasses 7.1+; and Class 305, Wheel Substitutes for Land Vehicles. | 
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