Hiller OH-23 Raven
…Hiller Aviation, took over support of some UH-12 variants in the 1970s, and later became Rogerson Hiller. In 1947, United Helicopters (later renamed Hiller Aircraft) developed the prototype Model 360X helicopter. A year later, on 14 October 1948 the Civil Aeronautics Authority (CAA) issued a production certificate…