pencil sharpening machines, electric or non-electric; aquarelles; lithographic works of art; paintings [pictures], framed or unframed; mats of paper for beer glasses; biological samples for use in microscopy [teaching materials]; moisteners [office requisites]; office requisites, except furniture; electrotypes; terrestrial globes; paper coffee filters; bookbinding apparatus and machines [office equipment]; paper cutters [office requisites]; paper wipes for cleaning