US PATENT SUBCLASS 33 / 382
.~.~.~.~.~ Coacting at an angle

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}
381  DF  .~.~.~.~ Plural {2}
382.~.~.~.~.~ Coacting at an angle

DEFINITION

Classification: 33/382

(under subclass 381) Device wherein the two nearly filled receptacles are so related that they function simultaneously and at an angle to each other, thus determining two horizontal lines which in turn determine a horizontal plane.