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• Underwriters Laboratories, Incorporated
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  Cementitious Material in a Three-Beam Assembly. Universal Fire Bar, Inc., Arlington, VA
  Underwriters Laboratories, Inc., Northbrook, IL
  ['File R6183-4', 'Assignment 70NK3374']
  File R6183-4; Assignment 70NK3374
  May 11, 1971
  42 p.