US PATENT SUBCLASS 33 / 428
.~.~ Straightedge bisects right angle of square (i.e., centering square)


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33 /   HD   GEOMETRICAL INSTRUMENTS

403  DF  STRAIGHTEDGE TYPE {16}
427  DF  .~ Square and sliding nonpivotal straightedge(s) {1}
428.~.~ Straightedge bisects right angle of square (i.e., centering square)


DEFINITION

Classification: 33/428

Straightedge bisects right angle of square (i.e., centering square):

(under subclass 427) Subject matter wherein the straightedge is situated such that as it slides on the square, an edge of the straightedge indicates two equal angles of 45 deg..