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Born in 1958 as a small locksmith workshop in the centre of Ferrol, opened to provide parts for the suppliers of the naval industry, created by Manuel Derungs, who at the time was Master of the military arsenals, along with three employees.

By 1964 TMG was already directly supplying all the shipyards in the estuary and expanded its production areas to become one of the main auxiliary companies of the Spanish shipbuilding industry. With steady growth and internationalization as strategies, and the experience of over six decades, the activity of TMG has diversified and covers different sectors: Automotive industry, Renewable energy, Offshore, Naval…, developing highly competitive products in premises spanning over 4,000 square meters, located in the industrial park Río do Pozo in Narón.