Sorry, if I had read my sources before posting......... Nizbor was nationalised in early 1946, and was part of Cesky Kristal until the end of December 1949. It joined Inwald's Podebrady factory, as Works number 2, of the Podebradske Sklarny National Corporation on the 1st of January 1950. Podebradske Sklarny underwent an name change in 1965, becoming Sklarny Bohemia, Podebrady in 1965.
Sources Langhamer 1985, Jackson 1996, Langhamer 2005, and CGR 1992/12/p11-22.
Marcus