Considering that most probably no plans of German WW I Tractors have survived until that day, detail shots play an important role as reference material for the modeller.
Thanks to ebay, we have luck that such a photo surfaces from time to time ...
Here a recent and not too bad rear pic of an Dürkopp tractor:
Some older pics:
Cheers, Peter
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"Siplicity is the ultimate sophistication" -Leonardo Da Vinci-