| http://www.w3.org/ns/prov#value | - l for induction cooking can be made by using a laminated material as is illustrated in the fragmentary view of FIG. 3 compris ing a relatively thick core 25 of high thermal conductivity such as copper, aluminum or silver and a thin outer skin intimately bonded thereto on top and bottom of high resistance magnetic material 27 such as iron, magnetic stainless steel (martensitic) or porcelain enamele
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