US PATENT SUBCLASS 33 / 353
.~.~ Line plumb and bubble level

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
351  DF  .~ Diverse directional indicator {2}
353.~.~ Line plumb and bubble level

DEFINITION

Classification: 33/353

(under subclass 351) Device wherein one of the directional indicators is a pendulum weight suspended by a flexible line and another directional indicator is a bubble formed in a closed receptacle, nearly filled with liquid.