(under the class definition) Apparatus comprising a heat emitter and structure by which it is inserted into a hollow article or by which a hollow article is positioned about the emitter for the purpose of heating the interior of the article.
SEE OR SEARCH CLASS
34, Drying and Gas or Vapor Contact With Solids,
104+, for a drier for hollow articles.
59, for means for burning fuel within a well.
175, Boring or Penetrating the Earth, 11, for apparatus for boring the Earth including the direct application of heat to the formation.