US PATENT SUBCLASS 33 / 282
.~ Vertical angle

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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
282.~ Vertical angle {2}
283  DF  .~.~> Having gravity responsive indicating means (e.g., pendulum, etc.)
284  DF  .~.~> Including distance finding feature

DEFINITION

Classification: 33/282

(under subclass 227) Device for measuring an angle which is in a plane perpendicular to the plane of the horizon.