Approved Source : An in dependent per son, firm or corporation, approved by the building official, who is competent and experienced in the application of engineering principles to materials, methods or systems analyses
Complete Design, Inc. (Construction Design Specialists), Dictionary of Construction Terminology, Washington, USA 2015. http://completedesign.cc/client-resources/dictiona ry-of-construction-terminology, (Const - Amer) {836}