US PATENT SUBCLASS 454 / 73
.~.~.~ Mechanical operation of control system (e.g., by bellows or diaphragm, etc.)

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}
73.~.~.~ Mechanical operation of control system (e.g., by bellows or diaphragm, etc.)

DEFINITION

Classification: 454/73

Mechanical operation of control system (e.g., by bellows or diaphragm, etc.):

(under subclass 71) Subject matter wherein the operation of the control system, including the responsive means, is by primarily mechanical devices (e.g., bellows, diaphragm, piston, valve, etc.).