US PATENT SUBCLASS 33 / 376
.~.~ Add-on-type reference-surface section

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}
376.~.~ Add-on-type reference-surface section

DEFINITION

Classification: 33/376

(under subclass 365) Device including a surface for cooperation with a workpiece to determine a direction thereof, the surface involving several separable parts which cooperate to enlarge or diminish the effective surface by adding on, taking away, or substituting parts.