US PATENT SUBCLASS 33 / 290
.~ Level (i.e., surveyor's type)

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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
290.~ Level (i.e., surveyor's type) {2}
291  DF  .~.~> Self leveling
292  DF  .~.~> With tubular sighting means (e.g., telescope, etc.)

DEFINITION

Classification: 33/290

(under subclass 227) Device comprising a sighting instrument including means; e.g., bubble in a liquid, or pendulum, to indicate and/or effect adjustment to the horizontal of the line of sight of the device.

(1) Note. Included in this and indented subclass are devices for determining the difference in altitude between two points but provided with no angle measuring scales.

SEE OR SEARCH THIS CLASS, SUBCLASS:

282, for a vertical angle measurer.

365+, for a level, per se.