Source: wikibot/plessey-system-250
= Plessey System 250
{wiki=Plessey_System_250}
The Plessey System 250 is a type of telecommunications switching system developed by the Plessey Company in the 1960s. It was designed for use in telephone exchanges and was notable for its use of transistor-based technology, which was a shift away from earlier electromechanical systems. The System 250 was used primarily in the UK but also found applications in other countries.