US PATENT SUBCLASS 340 / 953
.~.~.~ Visual source

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

945  DF  AIRCRAFT ALARM OR INDICATING SYSTEMS {11}
947  DF  .~ Land-based landing guidance {5}
952  DF  .~.~ Particular energy guide source (e.g., sound, electric field, radio) {2}
953.~.~.~ Visual source {3}
954  DF  .~.~.~.~> Alignment of plural sources
955  DF  .~.~.~.~> Plural colors
956  DF  .~.~.~.~> Modulated light source

DEFINITION

Classification: 340/953

Visual source:

(under subclass 952) Subject matter wherein the guide source can be seen by the pilot.