What is the main industry Ostrava was known for during the 20th century?
Textiles
Automotive
Coal-mining and metallurgy
Electronics
Answer
During the 20th century, Ostrava was known as the "steel heart" of Czechoslovakia due to its status as a coal-mining and metallurgical center. Since the Velvet Revolution in 1989, the city has undergone significant economic changes and restructuring.
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