| http://www.w3.org/ns/prov#value | - a magnet secured to said flap and arranged to magnetize one surface of said flap with a S pole and magnetize the other surface with a N pole; and (d) a plurality of driving magnets located in the rear of said substrate and relatively movable to said substrate; (e) said driving magnet including S pole and N pole magnetized regions arranged such that, when said driving magnet arrives at a given posi
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