Booth designed an electromechanical computer, the ARC, in the late 1940s.

Many early electromechanical digital computers, such as the Harvard Mark I, were built from relay logic gates, using electro-mechanical relays.

In 1946 American Airlines decided to tackle this problem through automation, introducing the Reservisor, a simple electromechanical computer based on telephone switching systems.

The Z3 was an electromechanical computer designed by Konrad Zuse.

The Z3, the first fully operational electromechanical computer, was partially financed by German government-supported DVL, which wanted their extensive calculations automated.

As the last large electromechanical computer ever built, its greatest success was the publicity it provided for IBM.

The Harvard Mark I (1944), a large-scale electromechanical computer with limited programmability.

Svoboda had experience from building electromechanical computers in the USA, where he worked at MIT until 1946.

Rangekeepers were only one member of a class of electromechanical computers used for fire control during World War II.

The term "bug" was used in an account by computer pioneer Grace Hopper, who publicized the cause of a malfunction in an early electromechanical computer.