Three sizes of glass from Niemen and Falenica. On this pictures are three insulators. The smallest is J.Stolle Niemen 3rd size. Medium and the biggest are from "FALENICA", it is not known factory near warsaw. I can't find any information about it. Only two insulators embrossed "FALENICA". Maybe insulators are from Niemen, and Falenica it was seller or provider name. I don't know. Insulators are simmilar to Niemens.