The Mechanical Technologies division came into being officially on 1st January 1990 and was directed by G. Bachy until 1995.

This division brought together various mechanics groups from former accelerator divisions and also took over the Workshops and Special Technologies groups that used to be in Technical Support Division (ST). This grouping aimed to provide more effective support to all CERN divisions in terms of mechanical engineering and surface and materials technology as well as rationalizing and modernizing mechanical manufacturing facilities.

In 1996 MT division was renamed Engineering Support and Technologies division (EST) and was restructured with an enlarged mandate to provide, for the whole of CERN, centralized engineering services not only in mechanical domains but also in electronics and for the related technologies and tools.