Dynamic Group: Innovator And Leader Dynamic is the first corporation which came up with the concept of "silent oil free air compressor". Dynamic was founded in 2004, which combining R&D, manufacturing and marketing. Dynamic have 3 subsidiary companies in China. We also have set up Dynamic Group (Hong Kong) Co.,Ltd. in Hong Kong and Dynamic Medical LLC in Unites States. We are specializing in manufacturing silent oil free air compressors, oxygen concentrators, nebulizers, CPAP machines, ...