US PATENT SUBCLASS 33 / 442
.~.~.~.~ 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}
441  DF  .~.~.~ Double linkage {1}
442.~.~.~.~ With counterbalance

DEFINITION

Classification: 33/442

With counterbalance:

(under subclass 441) Subject matter including a weight device connected to the pantos:graphic device to oppose or offset the weight of or force acting on the straightedge device.