| http://www.w3.org/ns/prov#value | - Again,by the use of a refractory material for a cup-shaped mouth piece in which the mixture ot iuel with oxidizing agent impinges against the surrounding Wall, oxidation, which would be particularly destructive to metal at the high tem eratures incident to the operation, is who ly avoided. ll claim: 1.l A mouthpiece for gaseous fuel burners comprising a side Wall adapt/ed to tit an opening in a fu
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