| http://www.w3.org/ns/prov#value | - Patent US3966510 - Ferromagnetic powder for magnetic recording medium and method for ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More ??Sign inAdvanced Patent SearchPatentsA ferromagnetic powder which contains at least Fe--B or Fe--Co--B with the surface of the powder having thereon a layer of Cr or a layer mainly consisting of Cr and a method of preparing the ferromagneti
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