From Back Cover:
More than 250 years ago, Aleksandr Kerensky, Protector-General of the Star League, left known space. With him he took nearly half the Mechwarrios, Battlemechs and support personnel in the Inner Sphere. In the years that followed, the Inner Sphere's Successor States battled for supremacy, waging terrible wars that claimed millions of lives and crippled their technological knowledge and manufacturing capabilities. Now the descendants of Kerensky are returning, armed with superior 'Mechs and driven by one goal - Total domination of the Inner Sphere.
Battletech Technical Readout: 3050 provides illustrations, descriptions and game statistics for all state-of-the-art Inner Sphere Battlemechs and the Omnimechs used by the invading Clans. Technical Readout: 3050 also includes entries on rare Star League-era combat vehicles that have recently begun resurfacing in active duty.