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Answer: Bavarian Motor Works
Why: The roundel is not a propeller: its blue and white are Bavaria's colours, reversed because trademark law barred using state arms.
Answer: To honor owner David Brown
Why: David Brown bought Aston Martin after seeing a newspaper ad, paying £20,500 for the struggling automaker in 1947.
Answer: Double helical gears
Why: In 1900 André Citroën bought the rights to wooden V toothed gears he saw in Poland, and his first cars carried the twin chevrons from 1919.
Answer: Aircraft engines
Why: The Versailles treaty banned German aero engines, so BMW built railway air brakes; its first motorcycle came in 1923, its first car in 1928.
Answer: The electric clock
Why: The line ran as a David Ogilvy ad in 1958; he took it from a road test quote by the technical editor of The Motor magazine.
Answer: Lamborghini
Why: Refused an autoclave for the Countach Evoluzione's carbon fibre, he took a bank loan in 1987, bought his own and left in 1991.