What kind of German bike is this?
OP's answer-as-a-comment:


  The bike was not german, it was japanese. I found that the derailleurs were made by DNB Japan somewhere around 1960 and that the handlebar is french (Guidon Phillipe), but other than that , this bike is a mistery to me. The brakes only have a logo on them and the frame has only a number and a logo on the back. Underneath all the black paint, in the front, is a sticker but there is no way I can peel just the paint without damaging the sticker... On the pedals it says Lyotard 82 and they are in a rather good condition.


Thus, it is not identifiable.