In the 1920's, the idea of a bag-less vacuum cleaners was developed by John W. Newcombe. Another gentleman known as Leslie H. Green saw tremendous potential in this idea and joined forces with Newcombe. In 1929, Green created a new corporation named Rexair which means 'King of the Air'. T. Russ Hill joined Rexair in 1936 with the idea to add water to the Rexair designs which would trap the dirt and the dust. Rexair became well known in the community as a vacuum cleaner with the ability to eliminate airborne dust. By the late 1930's, allergy, hay fever sufferers, and soon medical professionals recognized this as a breakthrough product. In 1941, Rexair paired up with the Martin-Parry Corporation which provided Rexair with larger manufacturing capabilities. During World War II, these two corporations supported the war by providing radar cases, rocket launchers, and ship partitions and linings. 1955 saw the birth of the Rainbow, a sleek, streamlined design with a motor twice as powerful as before. Rainbow vacuum cleaners are known for their efficiency. The vacuum uses water to trap the dirt instead of a bag. The most recent Rainbow vacuum is the Rainbow e2; this cleaner has the latest technology which combines the power of air and the power of water for the best results in cleansing. The e2 includes a separator that keeps the dirt and the dust inside the machine, and then deposits it to the water basin. Its two-speed power control toggle helps control the pace of cleaning that is required. The Rainbow e2 is designed to not only remove dust from the floor, but from the air too, aiming to eliminate carbon particle inhalation. This product also features a powerful Hurricane motor, and an adjustable height nozzle. AHAM (The Association of Home Appliance Manufacturers) has certified the Rainbow e2 as an air cleaner designed to reduce air pollutants.