(under subclass 321) Apparatus in which the motor is of the type which includes a movable member which is motivated by either (1) the force of gravity or (2) a spring.
(1) Note. To fall within the scope of this definition the motivating force produced by the spring or gravitational force must be controllable or variable in intensity or direction to cause operation of the movable member, i.e., a weight or spring for exerting a continuous unidirectional
