Ivo,
J Schreiber and Neffen, established 1844, at Uhrovec, (birthplace of Antonin Dubcek of Prague Spring fame), Schrieber family involvement ended in 1938, when they emigrated to the United States. in the communist era, was known as Sklarny Lednicke Rovne, now Rona Crystal. Archives should be available. Possibly from the Slovak Glass MuseumFrom what I can make out the Rapotin glass-works were and still are manufacturers of laboratory glassware.
Marcus