An American National Standard. The American Society of Mechanical Engineers (ASME). Canadian Standards Association (CSA). Date of Issuance: December 30, 2009. 216p. Revisions being made in this Addenda are identified by a margin note, (b). Changes made to correct errors in A17.1-2007/CSA B44-07, as well as other new editorial changes, are identified by (ED). Revision designators will remain on the pages up to the publication of the next edition of the Code. The (ED) designators will appear only when the editorial changes are introduced.