Igor Sikorsky's patent application for a direct lift aircraft, which marked a significant milestone in the development of helicopters, was submitted on 27 June 1931. This application eventually led to the granting of U.S. Patent No. 1,994,488 on 19 March 1935. The VS-300, which incorporated the features described in the patent, was indeed the world's first practical helicopter and laid the groundwork for modern rotorcraft technology. Sikorsky's contributions revolutionized aviation by enabling vertical flight capabilities that are now essential in various fields including transportation, rescue operations, and military applications.
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