US PATENT SUBCLASS 33 / 379
.~.~.~ Bubble

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.~.~.~ Bubble {5}
380  DF  .~.~.~.~> Adjustable size
381  DF  .~.~.~.~> Plural {2}
384  DF  .~.~.~.~> Liquid container adjustable on reference-surface section {2}
389  DF  .~.~.~.~> Bubble-position indicia on reference-surface section
390  DF  .~.~.~.~> Universal, or plural indicating sections on container

DEFINITION

Classification: 33/379

(under subclass 377) Device wherein the liquid is within, and nearly filling, a closed receptacle, sufficient space being left superjacent the upper surface of the liquid to simulate a bubble.