DO MEMO NO. 279, S.2021. ISO 9001:2015 ADVOCACY OF THE LOCAL GOVERNMENT UNIT OF THE CITY OF MANDALUYONG Posted on September 15, 2021 by DepEd Mandaluyong Leave a comment DO MEMO NO. 279, S.2021. ISO 9001:2015 ADVOCACY OF THE LOCAL GOVERNMENT UNIT OF THE CITY OF MANDALUYONG Memorandum Numbered