US PATENT SUBCLASS 33 / 390
.~.~.~.~ Universal, or plural indicating sections on container

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}
390.~.~.~.~ Universal, or plural indicating sections on container

DEFINITION

Classification: 33/390

(under subclass 379) Device wherein the receptacle is so shaped as to either (1) define a level plane as distinguished from a level (horizontal) line or (2) have two separate and distinct sections for cooperation with the bubble, usually one section to indicate level and the other to indicate plumb.