(under subclass 283) Subject matter wherein the form is wound circularly to make a curve that constantly increases in size or the form has a portion that circles about a point in a curve that constantly increases in size.
SEE OR SEARCH THIS CLASS, SUBCLASS:
285, for layer-type powder forms.
332, for sheet-type blasting charges.
SEE OR SEARCH CLASS
149, Explosive and Thermic Compositions or Charges,
3, for a coating and a base or a support; and subclasses 14+ for superimposed or contiguous layers of different compositions or different properties.
