Which revolutionary building material was first unveiled at the 1889 Paris World's Fair, dramatically showcased in the structure that was the fair's entrance arch?

In the world of architecture, product launches can transform design possibilities and influence building trends for decades. From revolutionary materials to innovative systems, these launches often mark significant shifts in how architects approach their craft. Test your knowledge of iconic architectural product launches that changed the industry!

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Reinforced concrete (Système Hennebique)
Wrought iron (demonstrated in the Eiffel Tower)
Laminated glass (Pilkington process)
Aluminum curtain wall systems (Alcoa)