Name the Ukrainian/Russian American engineer who was first to viably manufacture and sell helicopters?
Igor Ivanovich Sigorsky Igor Sigorsky Igor Ivan Sigorsky Tania Sikorsky von York Igor Ivan Sikorsky I. Sikorsky Igor Ivanovich Sikorsky Igor Sikorski Igor I. Sikorsky Igor Sikorsky
igor sigorsky igor sikorski i sikorsky igor ivanovich sikorsky igor sikorsky igor ivan sikorsky igor ivan sigorsky igor ivanovich sigorsky tania sikorsky von york igor i sikorsky
igor sikorsky
WikipediaEntity
Igor Sikorsky