Which sustainable building material product was first developed specifically for mainstream architectural use in the 1930s, revolutionizing modern building facades?

Test your knowledge about when revolutionary architectural materials and products entered mainstream design practice. The development timeline of architectural materials has dramatically shaped what's possible in building design and construction. This question focuses on when a particular innovation became commercially viable and widely adopted in architectural practice.

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Curtain wall glazing systems
Cross-laminated timber (CLT)
Photovoltaic glass
Self-healing concrete