This might be a place to start:-
ILO
JLO (also spelled ILO) is a German engine manufacturer now owned by North American Rockwell Co.
Unless one is a fan of German motorcycles, the name Ilo is probably meaningless; this is a shame, for Ilo was one of the world´s most successful motorcycle and stationary engine manufacturers. The company was founded in 1911 initially designing and building rail road switching machinery. In those years, Ilo railroad switching equipment was to be found all over Europe, especially the German-speaking world, the Balkans, Scandinavia and Eastern European countries. During WW-1 they continued with this activity but also expanded their product line to include military hardware.............