US PATENT SUBCLASS 33 / 441
.~.~.~ Double linkage

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.~.~.~ Double linkage {1}
442  DF  .~.~.~.~> With counterbalance

DEFINITION

Classification: 33/441

Double linkage:

(under subclass 438) Subject matter comprising a pantos:graphic-type connection to the straightedge device and adapted to move freely over the support work surface at all time in a predetermined angular relationship to the support surface.