US PATENT SUBCLASS 454 / 166
VEHICULAR TUNNEL

Current as of: June, 1999
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454 /   HD   VENTILATION

166VEHICULAR TUNNEL {1}
167  DF  .~> With air pump

DEFINITION

Classification: 454/166

VEHICULAR TUNNEL:

(under the class definition) Subject matter wherein an enclosed passageway for a passenger transporting, goods transporting, or equipment transporting device is ventilated.

(1) Note. The enclosed passageway is often underground.

SEE OR SEARCH CLASS

104, Railways,

52, for smoke removers in roundhouses and train sheds over locomotive smoke stacks which may be provided with means for producing an artificial draft.