US PATENT SUBCLASS 33 / 291
.~.~ Self leveling

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

227  DF  STRAIGHT-LINE LIGHT RAY TYPE {20}
290  DF  .~ Level (i.e., surveyor's type) {2}
291.~.~ Self leveling

DEFINITION

Classification: 33/291

(under subclass 290) Device wherein adjustment to the horizontal is effected by means requiring no manual handling of the device; e.g., means responsive to terrestrial gravitation.