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The ZEST Michalovce plant is a company with a rich engineering tradition and history, founded in 1950. Since 1975 the company has started its expansion to foreign markets with the main production program (CS injection molding machines, machine vices and double-shell tanks), which have been exported to many countries.

Since June 2000, ZEST has been taken over by CASSPOS a.s. and is currently focused on the production of steel overground and underground double-wall tanks designed for pumping stations and storage of liquid. Machine-type vices of various types are another ZEST product, as well as steel welded units, load-bearing frames and basic frames of woodworking machines, steel, and aluminum processing technologies.