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Allan L.Griff, a plastics extrusion consultant and educator, has been working with plastics extrusion since 1955. He provides:
For all the details, go through the door 
to his complete web site.
Or, contact Allan Griff directly by:
Phone: 301 654 1515
Fax: 301 654 1414
Postal mail to:
5101 River Road
Bethesda, MD 20816 (USA)