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10.02.1916, Ferdinand Porsche congratulates Wilhelm Maybach with his 70th birthday (Deutsch) Ferdinand Porsche, Maybach 22.08.2016 1913
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1939, Joseph Mickl patent: Porsche typ 80 recordwagen (Deutsch) Ferdinand Porsche, Mickl, Porsche 80 31.12.2015 2800
1931, Grand Prix of Vienna had been cancelled. A letter from Ferdinand Porsche to the Magistrate of Vienna. (Allgemeine Automobil-Zeitung, Deutsch) Ferdinand Porsche 07.11.2015 1898