The document provides a history of the development of DGT chess clocks from 1985 to 2011, summarizing the introduction of various clock models over time. Some of the key clocks discussed include the DGT FIDE clock from 1994, which was the first digital clock to fully conform with FIDE laws of chess, the DGT 2000 from 1998 which was the best selling digital chess clock, and the DGT 2010 from 2007 which received the official FIDE chess clock status. The document highlights the improvements and new features incorporated into each new clock model as DGT evolved their product line to meet the needs of chess players and tournaments over decades.