US PATENT SUBCLASS 33 / 421
.~.~.~ Having angle or slope indicating means

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

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

DEFINITION

Classification: 33/421

Having angle or slope indicating means:

(under subclass 420) Subject matter having indicia on the straightedges for indicating a degree of incline or divergence.