US PATENT SUBCLASS 340 / 983
.~ Obstruction beacon

Current as of: June, 1999
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340 /   HD   COMMUNICATIONS: ELECTRICAL

945  DF  AIRCRAFT ALARM OR INDICATING SYSTEMS {11}
983.~ Obstruction beacon

DEFINITION

Classification: 340/983

Obstruction beacon:

(under subclass 945) Subject matter having a beacon at the location of an object to warn aircraft of the presence of that object.