(under subclass 452) Subject matter comprising a plurality of straightedges connected and pivoted to each other so that one of the straightedges cannot be adjusted to a new position without a proportional movement of the other straightedge(s).
(1) Note. The subject matter of this subclass generally relates to an angle determinator and bisector for use by skilled carpenters, mechanics, and other craftsmen in the measuring of angles and for determining the bisector of any angle measured.
