US PATENT SUBCLASS 416 / 42
.~ Pressure or altitude responsive

Current as of: June, 1999
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416 /   HD   FLUID REACTION SURFACES (I.E., IMPELLERS)

31  DF  WITH CONTROL MEANS RESPONSIVE TO NON-CYCLIC CONDITION SENSING, CENTRIFUGAL ACTUATION, TORQUE OR THRUST {9}
42.~ Pressure or altitude responsive

DEFINITION

Classification: 416/42

(under subclass 31) Apparatus wherein the control means is caused to operate in response to a means which senses (1) a condition of fluid pressure variation within the apparatus or the ambient or (2) the elevation of the apparatus relative to sea-level or ground-level.