Category:One-of-a-kind computers

The category of one-of-a-kind computers contains computer systems of which only one unit was ever produced. Such systems have typically been experimental prototypes and/or too massive, complex, and expensive to duplicate. Among these systems are the pioneering electro-mechanical and electronic computers made in the 1930s, 1940s, and 1950s, and, after that period, the largest supercomputing systems.