RT Web Page SR Electronic(1) ID 15306449 A1 A. Illingworth T1 Stages of inspection YR 2015 FD 2015-12-22 NO stages of inspection, PB Begell House Inc. PP New York DO 10.1615/hedhme.a.000449 RD 2025-04-29 UL https://hedhme.com/content_map/?article_id=449&link_id=15306 WT HEDH Multimedia - Heat Exchanger Design Handbook, Multimedia Edition WP 2015-12-22