GMG has pioneered the use of two of the five elements of Mother Nature, as raw materials for generating visible profit. They are: AIR GMG is a Numero Uno industrial gases manufacturing and marketing Company. The Company uses state-of-the-art Cryogenic Tonnage Air Separation Plants. These plants use atmospheric air as the raw material. GMG, manufacturer and supplier of industrial gases has a network of product gas manufacturing Cryogenic Tonnage Air Separation Plants, Filling Stations ...