Tonini Monorebus monoplane of 1911 was designed by Alessandro Tonini, and powered by a REBUS engine. The name of the machine was a contraction of both, becoming Monorebus. Tonini had initiated the firm Officine Mechaniche REBUS in Milan, which specialized in “Aeroplani, Motori per Aeroplani, Costruzioni Aeronautiche and Construzioni Mecchaniche”. After the Monorebus was successfully flown in June 1911, Tonini started designing revolutionary canard machines and later became chief constructor with Nieuport-Macchi.