US PATENT SUBCLASS 237 / 12.6
.~.~ Air

Current as of: June, 1999
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237 /   HD   HEATING SYSTEMS

12.1  DF  HEAT AND POWER PLANTS {3}
12.4  DF  .~ Car {3}
12.6.~.~ Air {1}
12.7  DF  .~.~.~> Radiator

DEFINITION

Classification: 237/12.6

(under subclass 12.4) Heating systems in which the car or train is heated by a supply of warm air supplied by the power plant.