Is there a way to suppress same labels from different attributes other than merging the attributes or manually deleting the labels?  

As you can see in the image below, I have multiple lines with the same label. I tried to create a buffer around the labels in order to reduce the amount of labels, but this messes up the labels of other features.

For instance: Is it possible to create a buffer for a certain string? 
So, that there is only one "B14" allowed in a certain radius..

Thank you in advance

[![enter image description here][1]][1]


  [1]: https://i.sstatic.net/l0iou.png