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I think it is the wind tunnel.... hope it correct
assembly lines
gunpowder
The process of removing salt from seawater
the Bessemer process
The development of the steel frame construction method allowed for the construction of skyscrapers by providing a strong and flexible support structure. This innovation enabled buildings to be constructed taller and more safely, making skyscrapers feasible and practical.
It allowed large numbers of goods to be produced quickly and inexpensively
A significant technological breakthrough during the Paleolithic era was the development of tools made from stone, such as hand axes and blades. This innovation allowed early humans to more efficiently hunt, gather, and process food. It marked a critical advancement in human evolution and survival.
It is not encouraged and does not exist in practice.
Skyscapers
Cotton gin
It allowed large numbers of goods to be produced quickly and inexpensively