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This was BMW's first significant aeroengine, known for its high altitude abilities. This was used in WWII.
http://en.wikipedia.org/wiki/Rapp_Motorenwerke#Early_engines -
This was around the time, the Prussian Army were placing Rapp engines in their planes.
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This was a great achievement for the company.
http://www.fantasycars.com/sedans/column/sedans2_bmwhistory.html