Lines with other classes and within this class (1) Note. Elements of a car, which are also elements of the subject matter of this class, but are modified in structure for use in combination with other elements of the car, the problem involved being more that of car construction than relating to the subject matter of this class, will be found in Class 105, Railway Rolling Stock. Copies of the patents in Class 105 which might be of value as references in this class have been placed in the class as cross references. (2) Note. Patents claiming combinations between car couplers and devices for other purposes incident to the use and operation of the car will be found in the classes in which such other devices are classified. The combination of a car coupler and means for coupling train-pipe service for air or steam forms an exception to the rule above noted and will be found in this Class 213, subclass 76. However, where such train line is secured to a coupler or drawbar and its operation is the same as though hung to any other part of the car the combination will be found in Class 285, Pipe Joints or Couplings, subclasses 24+ and 62+. The combination of a car coupler and connecting means for electric circuits forms another exception to the above rule and will be found in this Class 213, subclasses 1.3+. Where the combination is between a coupler and a brake see Class 188, Brakes. Where the combination is between a car coupler and means for unloading or loading a car, see Class 414, Material or Article Handling. (3) Note. Devices adapted to attach draft animals to cars will be found in Class 278, Land Vehicles: Animal Draft Appliances. (4) Note. For coupling and draft devices for trains of vehicles other than track vehicles see Class 180, Motor Vehicles, subclasses 14.1+, and Class 280, Land Vehicles, subclasses 400+.