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The Ralph E. Chambers Engineering Company was mainly an amusement park and carnival-ride building firm that took over the facilities of the bankrupt Traver Engineering Company in Beaver Falls, Pennsylvania from 1933 into 1962, although Harry Traver continued to work for the company.
As the founder of the Traver Engineering Company, Traver was responsible for the production of gentle amusement rides like the Tumble Bug and Auto Ride.
In 1919, he founded the Traver Engineering Company in Beaver Falls, Pennsylvania, which created amusement rides, including the Tumble Bug, The Caterpillar, Laff in the dark, Auto Ride, and the Circle Swing, a ride similar in concept to the earlier Captive Flying Machines ride popularised in the UK by American-born inventor Sir Hiram Maxim.