"Date of issuance: November 30, 2016"--Title page verso. "Reissued on January 16, 2017, to address errata"--Title page verso. "Twenty-first edition, ASME A17.1-2016/CSA B44-16, approved: July 25, 2016, issued : November 30, 2016, effective : May 30, 2017"--Page xii. Includes A17.1 Elevators and escalators, Interpretations no. 33, July 2012-October 2015 (pages iii-42). "An American National Standard." "ASME A17.1-2016/CSA B44-16 (Revision of ASME A17.1-2013 and CSA B44-13)." Includes index. |