Though less widely known than his contemporaries Thomas Edison and Gustave Eiffel, Russian engineer, scientist, and architect Vladimir Shukhov has drawn comparisons to both of them. His innovations in the petroleum refining process and the means of transporting petroleum products revolutionized the oil industry, while his architectural works were of a sort never seen before. He pioneered the construction of thin-shell and tensile structures as well as what innovative type of curved structure? Discuss
Source: The Free Dictionary