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The basic patented design allowed a series of features to be deployed on the spar-frame that would later allow quick development of new models. The original Vespa featured a rear pillion seat for a passenger, or optionally a storage compartment. The original front protection "shield" was a flat piece of aero metal; later, this developed into a twin skin to allow additional storage behind the front shield, similar to the glove compartment in a car. The fuel cap was located underneath the (hinged) seat, which saved the cost of an additional lock on the fuel cap or need for additional metal work on the smooth skin.
The scooter had rigid rear suspension and small 8-inch (200 mm) wheels that allowed a compact design and plenty of room for the rider's legs. The Vespa's enclosed, horizontally mounted 98 cc two-stroke engine acted directly on the rear drive wheel through a three-speed transmission. The twistgrip-controlled gear change involved a system of rods. The early engine had no forced-air cooling, but fan blades were soon attached to the magneto-flywheel (which houses the points and generates electricity for accessories and for the engine's spark) to push air over the cylinder's cooling fins. The modern Vespa engine is still cooled this way.
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. Vespa clubs popped up throughout Europe, and by 1952, worldwide Vespa Club membership had surpassed 50,000. By the mid-1950s, Vespas were being manufactured under licence in Germany, the United Kingdom, France, Belgium and Spain; in the 1960s, production was started in India, Brazil and Indonesia. By 1956, one million had been sold, then two million by 1960. By the 1960s, the Vespa—originally conceived as a utility vehicle—had come to symbolize freedom and imagination, and resulted in further sales boosts: four million by 1970, and ten million by the late 1980s. (Source: en.wikipedia.org)