| http://www.w3.org/ns/prov#value | - to the rotating drum, and a series of rollers at least certain of which are driven, spaced with respect to said forming drum, said series of rollers including means providing for heating a first film prior to its being fed onto said drum to a temperature above the melting point temperature of the second mentioned stratum of the film but below the melting point temperature of the first mentioned st
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