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from Brown Corpus
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Poster Products Inc., Chicago, Ill.: a changeable copy and display sign which consists of an extruded impact styrene background in choice of colors, onto which are mounted snap-in letters, figures, or words screened on acetate or other types of sheet stock.
The background, which is available in various widths and continuous lengths, is extruded with parallel undercut grooves which grip the flexible letters securely.

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