US PATENT SUBCLASS 33 / 420
.~.~ Straightedge as a hypotenuse of the square

Current as of: June, 1999
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403  DF  STRAIGHTEDGE TYPE {16}
418  DF  .~ Square and pivoted straightedge {5}
420.~.~ Straightedge as a hypotenuse of the square {1}
421  DF  .~.~.~> Having angle or slope indicating means

DEFINITION

Classification: 33/420

Straightedge as a hypotenuse of the square:

(under subclass 418) Subject matter comprising two straightedges connected to each other at an angle of 90 deg. and one or more straightedges or other means to determine a straight line arranged to slide over the first-named straightedges, so as to be connected to each of them at selectable distances from the right angle.