SIELMAN S.A. is a high technology company dedicated to the design, manufacturing of military spare parts and maintenance of military equipment. Founded by Theo Efremides in the city of Volos in 1982, SIELMAN S.A.  has been offering high quality services to NATO, the USA, Hellenic Army, Air Force and Navy during the last 25 years. An area of 120000 sq. m. at the Industrial area of Volos, equipped with state-of-the-art equipment and innovative production methods insure the highest value to our customers.