Air Liquide; Linde Group; Praxair Inc.; Air Products and Chemicals; Messer Group; Southern Industrial Gas Berhad; Taiyo Nippon Sanso Corporation; Gulf Cryo; Emirates Industrial Gases Co. LLC; nexAir; CanAir Nitrogen; Chengdu Taiyu Industrial Gases; Universal Industrial Gases; Yingde Gases Group Company; Aspen Air Corp.