This bloodline traces back the sires to what have been identified as the 3 foundation lines of the German Shepherd. Mutz von der Pelztierfame, Quanto von der Wienerau and Canto von der Wienerau.
The bloodlines may not be complete either because no information is available or the data has not yet been completed. 

Sire Bloodlines for
Yule vom schönen Blick
 
Bomber vom Wolfsheim
Vito vom Waldwinkel
Tom van't Leefdaalhof
Qerry vom Haus Antverpa