I realize this is an old post but I was just looking up my maternal grandfather's surname (Aronowitz/Aronwicz0 and happened upon here. My Great grandfather's name was Abraham Aronowitz (I believe) and he lived in Elberfeld though he may have actually been born in Poland. I have more info at home but we have no pictures of him. Eventually they emigrated to Mexico where he died and is buried in Mexico City. if I hear back from you, I will try to collect the info I have and see if we can find some commonality. I am heading to Germany in a few weeks but only going to be in Stuttgart and won't have time to visit Elberfeld though I doubt there is much for me to loo for. My grandfather left Germany when he was 6 or 7. Supposedly the family also moved to Belgium for a while and owned a restaurant.