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Higgins, P. J.; Ballanco, J. A.
view article (1.0)Backflow Protection for Water Supply to Fire Sprinkler Systems? Double Check Valve vs. Reduced Pressure Principle Backflow Preventer.Building Official and Code Administrator, Vol. 23, No. 2, 18-20, March/April 1989Higgins, P. J.; Ballanco, J. A.
view article (1.0)Backflow Protection for Water Supply to Fire Sprinkler Systems.P. J. Higgins and AssociatesPlumbing Engineer, Vol. 17, No. 6, 40-42, July/August 1989