(under subclass 1.13) Velocipedes in which the figure is constructed as a shell or in which a solid body has been provided with one or more openings or cavities, usually to accommodate operating parts of the progressing mechanism.
(1) Note. Bodies having apertures to receive nonmoving parts which fit more or less closely therein are not considered to be hollow within the meaning of this definition.
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1.195, for bodies having slots to permit rocking movement of the body relative to rigid or rigid link steering means passing therethrough.