This is the fourth edition of ASME A17.1/CSA B44, Safety Code for Elevators and Escalators. It replaces the previous editions of ASME A17.1/CSA B44, published in 2013, 2010, and 2007; and the previous editions of CSA B44, published in 2004, 2000, 1994, 1990, 1985, 1975, 1971, 1966, 1960, and 1938.