Evan John David, Aircraft: its development in war and peace and its commercial future (1919)
“ Indeed, the Mercedes motor used on Zeppelin, aeroplane, and automobile was the same in fundamentals.To Americans who are familiar with the difficulties we experienced in the early days of our entrance into the World War in getting quantity production with the Liberty motor, it is evident from the fact that the Germans had three large factories filled with tools, dies, gigs, etc., for quantity production of the Benz, [70] Mercedes, and Maybach engines, that Germany believed that she had control of the air in June, 1914. ”
