What firm founded in 1915 did work on the the tallest building in the Western Hemisphere
Jaros, Baum &amp; Bolles: Jaros, Baum & Bolles (JB&B) is an American MEP (Mechanical, electrical, and plumbing) and building systems engineering firm founded in 1915 by Alfred L. Jaros, Jr. and Albert L. Baum. One World Trade Center:  It is the tallest building in the Western Hemisphere, and the sixth-tallest in the world.
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