Underwriters Laboratories - http://www.ul.com

U.S. Patent Office - http://www.uspto.gov

Emhart Teknologies - http://www.emhart.com/index2.html

McMaster-Carr - http://www.mcmaster.com

American National Standards Inst. - http://www.ansi.org

American Society of Testing & Materials - http://www.astm.org

Society of Plastic Engineers - http://www.4SPE.org/ or http://www.plasticindustries.com