Description
Class B43L : ARTICLES FOR WRITING OR DRAWING UPON; ACCESSORIES FOR WRITING OR DRAWING
Subclass 7/08: Straightedges (guides for rulers other than for T-squares B43L 13/04; curve rulers or templets B43L 13/2; straightedges characterised by the provision of indicia or the like for measuring, e.g. rulers or tapes with measuring scales or marks for direct reading, G01B) with arrangements for attaching additional drawing equipment, e.g. for hatching, dotting