US PATENT SUBCLASS 428 / 80
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STOCK MATERIAL OR MISCELLANEOUS ARTICLES
(under the class definition) Product which is a sheet having an outer perimeter other than rectangular (i.e., four sides with right angles between each two adjacent sides).
SEE OR SEARCH THIS CLASS, SUBCLASS:
51, for a two-dimensional sectional layer in which the sections are nonrectangular.
64.1+, for a circular sheet.