5cm E.Kzdr. m. Bdf.

[Bever]

A 5cm nose fuze for the 5cm Spgr. L/3,3 , more specifically ‘E.Kzdr. m. Bdf. f. 5cm’ what does ‘m. Bdf’ stand for?

If anyone knows & could tell me , would be much appreciated.
Thank you

 

[Alpini]

"mit Bandfeder" (part of safety mechanism)

 

[Bever]

"mit Bandfeder" (part of safety mechanism)

thanks a lot .