What type of steel was used in mid–20th century developments and was a Raphael S. Soriano specialty?
Raphael Soriano:  He pioneered the use of modular prefabricated steel and aluminum structures in residential and commercial design and construction. Mid-century modern: Mid-century modern is a term that describes mid–20th century developments in interior, product, and graphic design, architecture, and urban development from roughly 1933 to 1965.
prefabricated steel