National Board of Fire Underwriters (1866–1965 when it became the AIA and phased out its technical activities and its contributions to fire protection engineering)
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NBFFL - NBFH - NBFI - NBFL - NBFP - NBG - NBGA - NBGH - NBGK - NBGN
"NBFU." Abbreviations.com. STANDS4 LLC, 2015. Web. 29 Mar. 2015. <http://www.abbreviations.com/NBFU>.