Nice find on the trademarks.

It is possible that ingots or tube steel was shipped to Liege, but I'd hedge my bets there was a licensed facility there. The may not have made steel but produced raw forgings for the tube makers.

I haven't found a pic of a Britte lock, but Littlegun has some interesting factory pics: http://www.littlegun.be/arme%20belge/artisans%20identifies%20b/a%20britte%20gb.htm

Kind Regards,

Raimey
rse