(under subclass 383) Apparatus in which the axis of rotation of the wheel may freely change its angular position and there are means operable to hold the axis against movement to prevent free change of the angular position of the wheel.
(1) Note. Apparatus in which there is a latch designed to hold the axis of rotation in different positions and which would permit free angular movement if manually held out of operation are classified in subclass 383 rather than under this definition.
