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http://www.visigraph.com/traffic-signs.....tic-diamond-grade-reflective-sheeting/

These are the public entries for this link:

• Engineer, Diamond, and High Intensity Grade Reflective Signs
  What is the difference between Standard Reflective (Engineer Grade or Type I), and High Intensity (Type III) and Diamond Grade (Type XI) reflective sign material?
  By barrybrown61 in Public bookmarks with diamond engineer grade high intensity reflective sign
• Engineer, High Intensity, and Diamond Grade Reflective Sheets
  Engineer Grade Reflective Sheeting typically meets ASTM D4956 Type 1 standards and is an enclosed film or lens using glass beads or prismatic optical technology....
  By barrybrown61 in Public bookmarks with diamond engineer grade high intensity reflective sheets

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