One of the major difficulties with Czechoslovakian glassworks is the difficulty in establishing the post-war histories of glassworks during the years of communist control. The expulsion of Sudeten Germans, with the changing of placenames, Carlsbad to Karlovy Vary etc did not help.
Following the nationalisation of the major industries in 1945, things got even more uncertain. For example Borocrystal based in Novy Bor, consisted of 55 glass workshops (1948) but according to some sources, by 1951, the Borocrystal Narodni Podnik had closed 30 workshops, with another nine devolved???? (Closed/Making different product???Transferred to other national corporations???) Nor is it easy to find out which workshops were involved, which closed, etc.
Centralised planning and organisation linked companies together, and few factories kept original names. Moser and Egermann just hung on to their names, as pragmatists realised the importance of quality brand-names.In 1951, the first re-organisation of the glass industry, towards the end of the First Five-Year Plan, created eight Narodni Podniks, covering 43 factories. Changes, re-structuring, renaming happened on a regular basis.
I am working my way through this morass, to work out a chronology of post-war Czechoslovakian glassworks, but it is slow going. Once I have more on Cesko-moravske, will post it for you.