Bookbinding machines for office use; Document laminators for office use; Duplicating machines; Envelope sealing machines, for offices; Mechanical pencil sharpeners; Office hole punchers; Office perforating machines; Paper binding machine for office use; Paper shredders for office use; Paper staplers; Pen holders; Pencil holders; Pencil sharpening machines, electric or non-electric; Staple removers; Staplers being office requisites