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• s  having a thickness made up of four layers or strands
  four-ply yarns

• But both companies claim that four-ply rayon is as sturdy as six-ply cotton.
• Instead of bottling their vintages in conventional glass, nearly two dozen California wine makers, including Almaden and Geyser Peak, are putting up bulk wines in four-ply plastic .
• Proudly signing the Clearing House statement were two banks which had contemplated entering the four-ply mergerManufacturers Trust and Public National Bank.