| http://www.w3.org/ns/prov#value | - BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an elevational side view of an embodiment of the invention showing a conventional cast-iron Humphreys spiral separator fitted with magnets according to the invention; FIG. 2 is an enlarged sectional view of a portion of the trough of the spiral separator of FIG. 1 and FIG. 3 is a perspective view of a magnet means in accordance with the invention.
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