Coroner is a Swiss technical thrash metal band from Zurich. They garnered relatively little attention outside of Europe. They combined elements of thrash, progressive rock, jazz, and industrial metal with suitably gruff vocals that have put them at times in a death metal camp. They did not completely fall into any of those categories but integrated influences from them while some defined their style. With their increasingly complex style of progressive rock-infused thrash, they are often labeled as "the Rush of thrash metal" by music critics.
Coroner's sound then progressed and the production became more refined, resulting in the more progressive albums such as; No More Color, Mental Vortex and Grin. [From Wikipedia]