US PATENT SUBCLASS 33 / 231
.~.~ With ground speed indicator

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
229  DF  .~ Aerial bomb sight {2}
231.~.~ With ground speed indicator

DEFINITION

Classification: 33/231

(under subclass 229) Device including means for measuring and indicating the velocity of the moving craft with respect to the ground.

SEE OR SEARCH CLASS

73, Measuring and Testing,

488+, for a device there provided responsive to a speed condition.