could it be a dealer of fuel in europe ? maybe still to this day ? ........... here is a link to a railway tank car model that features it on the side , thats my best guess as in the German language which I speak there are no such words that mean anything, so this is my best guess
http://cgi.ebay.de/Maerklin-4524-Ess...item2ea9debb4d
hope it helps.