(under subclass 269) Method or apparatus for making a hollow cylinder including a portion that is known chemically as a metal.
(1) Note. Included herein is assembling a metal (including foil) with a nonmetal in the formation of a tube.
SEE OR SEARCH CLASS
72, Metal Deforming, for forming an article, including forming a tube, of metal or of a metal/nonmetal laminate including bending or drawing of the metal.
