(under subclass 269) Method or apparatus comprising changing, very slightly, a dimension of the formed hollow cylinder.
(1) Note. The operation of this subclass normally involves mere modification of a surface of the tube without significant thinning flow or removal or a portion of the work.
SEE OR SEARCH THIS CLASS, SUBCLASS:
287+, for making a tube and shaving that tube to size.
293, for making a tube combined with causing a thinning flow of the material, to change the dimensions of the cylindrical member.
SEE OR SEARCH CLASS
264, Plastic and Nonmetallic Article Shaping or Treating: Processes, for a method of reducing the size of a tube including thinning (or thickening) flow of the material.
425, Plastic Article or Earthenware Shaping or Treating: Apparatus, for apparatus for reducing the size of a tube including thinning (or thickening) flow of the material.
