| http://www.w3.org/ns/prov#value | - The heating agents may be formed from a variety of materials, for example fibers including ferromagnetic material selected from the group consisting of: iron, nickel, cobalt, chromium and alloys thereof; preferably, the fibers can be selected from the group consisting of: carbon steel fibers, magnetic stainless steel fibers, nickel fibers, ferromagnetic coated electrically conductive fibers, ferro
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