First Combine Harvester | 1936
Moore and Hascall
Hiram Moore and John Hascall of Kalamazoo County, Michigan built the first working combine. The first version was 17-feet long with a 15-foot cut. Up to 30 mules or horses were needed to pull the combine, with a ground-driven bull wheel providing power to the moving parts of the combine.
Source: Davide Costanzo
First Helicopter | 1939
United Aircraft Corporation
The world’s first practical helicopter, VS-300, took flight at Stratford, Connecticut. It was designed and piloted by Igor Sikorsky and built by the Vought-Sikorsky Aircraft Division of the United Aircraft Corporation. The helicopter was the first to incorporate a single main rotor and tail rotor design. Its inaugural flight lasted only a few seconds.
Source: Connecticut History