FN D'Armes de Guerre is "loosly interpreted" National Factory of Arms for War, which was FN's (Fabrique Nationale) primary livlyhood. I think that should be Depose rather than Defose. I do not know the exact translation of it, but in effect I believe it means the patent is registered or recorded. The term is often seen in conjuntion with trade-marks & then normally reads Marque Depose.

Miller/TN
I Didn't Say Everything I Said, Yogi Berra