atx ordnance code on top of SMi-35 "S-mine"

[Alpino]

Recently acquired enough parts to construct an inert SMi-35 "S-mine" for my Finnish WW2 weapons collection.
Until I can find a complete one.
The top/central piece is marked "atx 41"

I am guessing atx might be atw, which is Mannesmann-Roehrenwerke AG, Witten plant, Ruhr - which made steel tubing before the war,
which easily applies to the S-mine.

IS atx a different corporation? THANKS

[klarkon]

atx - Märkische Maschinenbau-Anstalt “Teutonia” G.m.b.H., Frankfurt/Oder

[Alpino]

Thank you Klarkon!
I am looking at what this company made before the war... milk separators
I wonder what else?