1921

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  • 23 September - 2 October 1921
  • Berlin's long-established motor show is staged for the first time since the end of the First World War. At the event DMG unveils the world's first series-built passenger car with supercharged engine in the shape of the 6/20 hp and 10/35 hp four-cylinder models. Series production of the now uprated 6/25 hp and 10/40 hp models does not start until the end of 1922. The supercharger technology is an early example of efficiency enhancement in internal combustion engines. An engine-driven blower forces the petrol-air mixture under pressure into the cylinder so that the cylinder charge can be increased to produce higher output. With the help of supercharging, the first supercharged Mercedes develop 38 hp / 28 kW with only 1.6 litres displacement, and 65 hp / 48 kW with 2.6 litres displacement – over 50 % more than without a supercharger.
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  • 24 September 1921
  • Franz Hörner drives his 10/30 hp Benz racing car to victory in the Class XB race (for cars up to 10 taxable horsepower rating and with overhead valves) at the inauguration of the AVUS race circuit in Berlin. Hörner records an average speed of 118.1 km/h over a distance of 157.4 km.
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  • 5 November 1921
  • Daimler-Motoren-Gesellschaft applies for legal protection of new interpretations of its trademark. A three-dimensional three-pointed star set a ring - with a version for use as a radiator emblem - is submitted to the Patent Office. It officially becomes a registered trademark on 2 August 1923.
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