Evidently these particular "Glass Artisans" lack a collective name !!! Some labels seem designed to mislead rather than inform but perhaps this particular factory was in the process of being re-privatised at the time. Well that's the kindest explanation I can come up with.
Trying to esablish a maker on the basis of such an ancient establishment date claim is not easy. Getting accurate dates around this time seems difficult and contentious; a time when there were wars, crusades and rebelions going on. We can only say who it isn't at this stage.
This site confirms the 1414 date for Chřibsk√° http://www.crystal-treasury.com/history.htm#Order
which also notes that that date as being deduced rather than documented.
Beranek claim a history only back to the late 30's; Moser 1857; Rudolfova hut glassworks (Inwald) 1885. Inwald itself was originally a Swedish firm.
This history for Bohemia-Crystalex http://web.bct.cz/en/site/about/history.html
is rather vague and short on precise dates but nothing claimed for it or its predecessors further back than the "18th and 19th centuries".
What is significant here is the Czech Republic part which we have been taking as post '89 (Velvet Revolution) and while it's true that the country was renamed as Czech and Slovak Federal Republic shortly after (April 1990) the Velvet Divorce, officially separating Czech and Sovakian Republics didn't happen until January 1993. http://www.slovakia.org/history-breakup.htm
So it's unclear from this exactly when Czech Republic labels would have come into use.