| http://www.w3.org/ns/prov#value | - s of Producing the Same???, describes particles of a particle size of about 3 micrometers composed mainly of gelatin and containing 0.00001% to 2% ferromagnetic substance composed of ferrite. (8) Margel, U.S. Pat. No. 4,324,923, ???Metal Coated Polyaldehyde Microspheres???, describes polyaldehyde microspheres coated with a transient metal and containing ferromagnetic substance such as iron, nickel
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