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The original was posted on /r/todayilearned by /u/sllih_tnelis on 2024-07-14 20:51:11+00:00.

Original Title: TIL about ‘Superfest’, a Chemically Strengthened ‘Almost Unbreakable’ Glass invented in East Germany in the 80s. Also learned that manufacture stopped in the early 90s, because it was deemed to not be profitable by western markets.