US PATENT SUBCLASS 180 / 20
Current as of: June, 1999
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(under the class definition) Motor vehicles wherein one or
more rollers support the body or frame.
(1) Note. Patents for power steering-gear disclosing a steering-roller are placed in this subclass.
SEE OR SEARCH CLASS
172, Earth Working,
133+, for rollers combined with other earth working tools and subclasses 518+ for some types of rollers specific to agricultural use.
404, Road Structure, Process, or Apparatus, 122+, for a device for working earth or road material provided with one or more rollers.
492, Roll or Roller, for a roll, per se, not elsewhere provided for, and see the notes thereunder.