Part of Schott AG
In 1927 increasing automation and sharp competition led to the holding of the majority of shares of the Jenaer Glaswerk Schott & Gen which was finally acquired in 1929. The manufacturing of flat glass in Zwiesel was given up completely in 1931 in favor of bottle glass production. At this time the plant in Zwiesel had about 450 persons employed. During the thirties the glass production stagnated. Due to the scarcity of raw materials in World War Two, bottle glass production was stopped altogether on 22 April 1944 and only war-important optical glass was produced.
Since the Vereinigten Farbenglaswerke AG, as the Jenaer Glaswerk Schott & Gen. was called since 1940, lost their main facilities in Jena due to the war, production of optical glass was continued in Zwiesel, until on 10 May 1952 the new main plant in Mainz was opened.
Read more about this topic: Zwiesel Kristallglas
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