US Patent 7389575 Method of manufacturing permanently magnetized elements

There is disclosed a method of manufacturing a plurality of removable permanently magnetized elements from a substrate comprising ferrite material. The method prints symbol images on the substrate with an offset, automatic sheet-fed press, and die cuts the symbol images on the substrate with an automatic sheet-fed die cutter to form a plurality of elements forming portions of the substrate. Thereafter, the method magnetizes the ferrite material to permanently magnetize the substrate and form the plurality of permanently magnetized elements. The method reduces wastage, permits for improved substrate registration, more accurate symbol placement on the substrate, higher production speeds, and reduced labor costs.