(under the class definition) Special devices not ordinarily used in steering or propelling in flight, incorporated with aircraft structure and particularly adapted to provide for steering and/or propelling the aircraft on land or water or both.
(1) Note. For ordinary propulsion devices, see this class, subclass 62, and indented subclasses.
(2) Note. For steering by means of brakes either on land or water, see this class, subclasses 111 and 112.
(3) Note. For ordinary control devices, see this class, subclass 75, and indented subclasses.
(4) Note. For rudder bars used to control ordinary steering apparatus and also to control brakes for steering, see this class, subclass 235.
(5) Note. For composite air and land or water craft, having the air sustaining means removable for conversion into operable land or water craft, see this class, subclass 2.
