Piaggio filed a patent for the Vespa scooter design in April 1946. The application documents referred to a "model of a practical nature" for a "motorcycle with rationally placed parts and elements with a frame combining with mudguards and engine-cowling covering all working parts", of which "the whole constitutes a rational, comfortable motorcycle offering protection from mud and dust without jeopardizing requirements of appearance and elegance". The patent was approved the following December. The first 13 examples appeared in spring 1946, and reveal their aeronautical background. In the first examples, one can recognize the typical aircraft technology. Attention to aerodynamics is evident in all the design, in particular on the tail. It was also one of the first vehicles to use monocoque construction (where the body is an integral part of the chassis). The company was aiming to manufacture the new Vespa in large numbers, and their longstanding industrial experience led to an efficient Ford-style volume production line. The scooter was presented to the press at Rome Golf Club, where journalists were apparently mystified by the strange, pastel coloured, toy-like object on display. But the road tests were encouraging, and even with no rear suspension the machine was more manoeuvrable and comfortable to ride than a traditional motorcycle. Following its public debut at the 1946 Milan Fair, the first fifty sold slowly—then with the introduction of payment by installments, sales took off. Have a nice Sunday.