US PATENT SUBCLASS 33 / 386
.~.~.~.~.~.~ Opposing spring

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}
384  DF  .~.~.~.~ Liquid container adjustable on reference-surface section {2}
385  DF  .~.~.~.~.~ Cam-type adjuster (e.g., gear, screw, wedge, etc. {2}
386.~.~.~.~.~.~ Opposing spring

DEFINITION

Classification: 33/386

(under subclass 385) Device including a resilient member exerting its force in opposition to one direction of motion of the cam.