US PATENT SUBCLASS 454 / 72
.~.~.~ Auxiliary control system

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
70  DF  .~ Pressure regulation {1}
71  DF  .~.~ Ventilation of aircraft cabin {3}
72.~.~.~ Auxiliary control system

DEFINITION

Classification: 454/72

Auxiliary control system:

(under subclass 71) Subject matter wherein a secondary control system is utilized in the event of failure of the primary control system.

(1) Note. Included in this subclass are auxiliary pressure relief systems.