Which architectural product innovation was first introduced by the Pilkington Brothers in 1959, revolutionizing modern building facades?

In the world of architecture, product innovation has transformed how buildings are designed, constructed, and experienced. From sustainable materials to smart building systems, architectural product design continues to evolve rapidly. This trivia question focuses on a groundbreaking product innovation that changed architectural possibilities. Test your knowledge about architectural product development history!

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Float glass manufacturing process
Self-cleaning photocatalytic glass
Low-E (low-emissivity) window coatings
Structural silicone glazing systems