''Names'' and reference. Vienna, Wenen, Bec and Wien are different
names with the same reference. Logic ''says'' whatever is true about
Wien is also true about Vienna , Wenen (Dutch) , Bec (Serbo-Crotian) .
Van den Hul seems to refer to the person Van den Hul. This however
does not mean that all cartridges ''Van den Hul'' are made by him.
So how can one know if an ''Van den Hul'' is made by him or by one
of his employee? The circumstance that so many are offered second
hand may suggest some answer.