The GAT-1B Link Trainer Flight Simulator
In 1928 Edwin A. Link began work on his "pilot trainer", and in 1931, he received a patent for a training device for pilots learning to fly by instruments only. It was a success and the Army Air Corps bought six in 1934. The Japanese Imperial Navy in 1935 used them to train their pilots for World War II and you know the rest of that story.
1941 LINK MODEL C-3 Flight Simulator
Also known as the Blue Box and Pilot Trainer was a flight simulator produced between the early 1930's based on technology pioneered in 1929 by Edwin Albert Link.