You're probably thinking of Rolls-Royce--one of the biggest jet engine manufacturers--but the first real jet engine was built by the Heinkel airplane company in 1935.
The first jet aircraft was the Heinkel He178 flown in 1939.
Rolls Royce
During the Korean War, the first American made jet engine for the US Air Force was General Electric. Soon after the Pratt and Whitney corporation developed a faster jet engine for the US Air Force.
Frank Whittle invented and built the first Jet Engine.
The first jet engine was made was in 1930 by Frank Whittle, but it didn't fly until 1941. Han von Ohain made one in 1936 and it flew in 1939.
The Germans invented the first operational jet engine during WW2.
The first jet engine was invented by a English engineer called Sir Frank Whittle
Gloucester is where the first jet engine was developed .
The first operational jet made, assembled and to take flight was the Messerschmitt Me 262
The jet engine made the world smaller by making travel time shorter. Also,helped to get humans into outer space. These are just a few things the jet engine did.
Dr. Hans von Ohain and Sir Frank Whittle are both recognized as being the co-inventors of the jet engine. Each worked separately and knew nothing of the other's work. Hans von Ohain is considered the designer of the first operational turbojet engine. Frank Whittle was the first to register a patent for the turbojet engine in 1930. Hans von Ohain was granted a patent for his turbojet engine in 1936. However, Hans von Ohain's jet was the first to fly in 1939. Frank Whittle's jet first flew in in 1941.