What used to make the framework of skyscrapers?

One common feature of skyscrapers is a steel framework from which curtain walls are suspended, rather than load-bearing walls of conventional construction. Most skyscrapers have a steel frame that enables them to be built taller than typical load-bearing walls of reinforced concrete.

Explanation:

The framework of skyscrapers are reinforced concrete frameworks and curtain walls of glass or polished stone.

Explanation:

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