US PATENT SUBCLASS 33 / 389
.~.~.~.~ Bubble-position indicia on reference-surface section

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

300  DF  INDICATOR OF DIRECTION OF FORCE TRAVERSING NATURAL MEDIA {23}
365  DF  .~ Level or plumb, terrestrial gravitation responsive {9}
377  DF  .~.~ Liquid type, upper surface utilizing {2}
379  DF  .~.~.~ Bubble {5}
389.~.~.~.~ Bubble-position indicia on reference-surface section

DEFINITION

Classification: 33/389

(under subclass 379) Device wherein the nearly filled receptacle is supported by a member having a surface of reference, usually adapted to be placed against a work piece, the member having thereon indicia for cooperating with the bubble to indicate the position thereof with respect to the

reference surface.