US PATENT SUBCLASS 33 / 380
.~.~.~.~ Adjustable size

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}
380.~.~.~.~ Adjustable size

DEFINITION

Classification: 33/380

(under subclass 379) Device provided with means for quantitatively changing the bubble simulating space.