US PATENT SUBCLASS 454 / 76
.~ Aircraft

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
76.~ Aircraft {1}
77  DF  .~.~> Freight

DEFINITION

Classification: 454/76

Aircraft:

(under subclass 69) Subject matter wherein the transporting device is particularly adapted to atmospheric flight.

SEE OR SEARCH THIS CLASS, SUBCLASS:

71+, for automatic pressure regulation of an aircraft cabin.