Power steering is a system for reucing the steering effort on vehicles by using an external power source to assist in turning the wheels. It is said that power steering was invented in the 1920s by Klara Gailis and George Jessup in Waltham, Massachusetts, USA. However, the earliest known patent related to power steering was filed (as recorded by the US Patent Office) on Aug. 30, 1932, by Francis W. Davis There is another inventor credited with the invention of power steering by the name of Charles F. Hammond (an American, born in Detroit), who filed similar patents, the first of which was filed (as recorded by the Canadian Intellectual Property Office) on Feb. 16, 1954 . Chrysler Corporation introduced the first commercially available power steering system on the 1951 Chrysler Imperial under the name Hydraguide. Most new vehicles now have power steering, owing to the trends toward front wheel drive, greater vehicle mass and wider tires, which all increase the steering effort needed. Modern vehicles would be extremely difficult to maneuver at low speeds (e.g., when parking) without assistance.