Der Eisendrache Panzer Claw Helmet

Setup - Make sure that there is a Panzer spawned ebfore doing anything. You will have to shoot each claw down and knife it when the panzer is close by.

Claw 1 - Can be found in the room outside of the power switch with a couple of staircases. It will be hanging onto the ceiling next to a ceiling support.

Claw 2 - Can be found above the entrance to the Wunderfizz location above the Doubletap area. This will be on the ceiling in the hall way.

Claw 3 - Can be found on the ceiling in the tunnel right next to Quick Revive. 

Helmet - Once each claw has hit the Panzers you should now have a Panzer helmet on. You are now invincible to Panzer melee attacks.