Whatisit? PreWar Christmas Quiz day 4

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The automobile featured in part four of our six day quiz was named after its two creators, one a count, the other a mechanic. They started with steam, but soon switched to petrol. Production was quite successful before WW I, but fell afterwards. Their design for the back axle is still legendary.
Just write down the make, but please DO NOT send us your answer before the last quiz has been published. Of course you can contact us on all other topics, because the PreWarCar offices are always staffed! From the participants with all answers correct, six names will be drawn at random. All six winners will receive the famous PreWarCar T-shirt. Good luck and if you like puzzles, try your hand at the PostWarClassic Xmas Puzzle. Enjoy this holiday season!
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