US PATENT SUBCLASS 33 / 498
.~.~ 90 degree limit

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
495  DF  .~ Pivot joints {3}
498.~.~ 90 degree limit {1}
499  DF  .~.~.~> Locking

DEFINITION

Classification: 33/498

90 degree limit:

(under subclass 495) Subject matter wherein the rotary movement of the straightedges is to a right angle maximum.