| http://www.w3.org/ns/prov#value | - In accordance with US. Patent 2,910,381, a system is employed for coating metals, such as iron, steel, aluminum, magnesium, etc., which comprises the provision of a coating system for metals in which a facing layer of a highly moisture resistant and chemically resistant polyurethane resin is bonded to a surface preparation layer of a polyvinylacetal type resin.
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