“Another major cluster of plastics manufacturers has devel aspwv1970-01-01T00:00:00-05:00January 1st, 1970|Twitter| “Another major cluster of plastics manufacturers has developed in southwestern Pennsylvania, which has more than 10… https://t.co/x060gJ8Qlq Share This Story, Choose Your Platform! FacebookTwitterRedditLinkedInWhatsAppTumblrPinterestVkEmail