(under subclass 3) Machine for disintegrating and removing indicia from a surface by rubbing contact therewith, the rubbing-contact instrumentality of the machine comprising a body composed of particles which are so in cohesive as to permit disintegration of the surface-contacting portion of the body, along with the indicia, whereby substantially to avoid mutilation of the surface.
SEE OR SEARCH CLASS
451, Abrading, for an eraser comprising an abradant body (i.e., a body claimed as including crystalline particles with sharp edges which mutilate a work surface). Note that a similar eraser without claimed crystalline particles is included in Class 15, the generic locus for an eraser, even if broadly claimed as an implement for "abrading," and if the sole disclosure is to an erasing body having crystalline particles.
