 Sergei Lebedev invented the first commercially viable and mass-produced type of synthetic rubber.The first ternary computer, "Setun", was developed by Nikolay Brusentsov.In the 20th century a number of prominent Soviet aerospace engineers, inspired by the fundamental works of Nikolai Zhukovsky, Sergei Chaplygin and others, designed many hundreds of models of military and civilian aircraft and founded a number of "KBs" ("Construction Bureaus") that now constitute the bulk of Russian United Aircraft Corporation.