Germans had magnetic mines
But germans believed there own german bias that everyone copies from germans
Now Zimmerit did had one advantage=Captured Hoffladungs couldnt be used against zimmerit equipped tanks
HOWEVER
the biggest disadvantage was that a zimmerit was applied when the vehicle was done.........And the vehicle coated in zimmerit had to remain idle for >3< days for the zimmerit to dry
Zimmerit was recently copied by someone on youtube, and it did worked..