US PATENT SUBCLASS 33 / 440
.~.~.~.~ With counterbalance

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

403  DF  STRAIGHTEDGE TYPE {16}
430  DF  .~ Base attached {8}
438  DF  .~.~ Universal parallelism arrangement {2}
439  DF  .~.~.~ Wheel and band {1}
440.~.~.~.~ With counterbalance

DEFINITION

Classification: 33/440

With counterbalance:

(under subclass 439) Subject matter including a weight device connected to the band to oppose or offset the weight of or forces acting on the straightedge device.