- SM PONTON, our sister company (design, production and installation of reinforced concrete pontoons and mooring/anchoring systems)
- State Navigation Authority (Štátna plavebná správa)
- Czecho-Slovak Lloyd (classification society)
- Slovak Lloyd (classification society)
- The Czech Register of Shipping and Industry Ltd., Praha (classification society)
- Germanischer Lloyd GmbH, Wien (classification society)
- Bundesministerium für Verkehr, I. u. T., Oberste Schiffahrtsbehörde, Wien (board of shipping)
- Volvo Penta Central Europe GmbH, Austria, Tribuswinkel (ship engines and their equipment)
- van der Velden B.V., Rotterdam (rudder systems)
- van Voorden B.V., Zaltbommel (ship-propellers)
- John Crane-Lips Germany GmbH, Duisburg, (ship-propellers, propeller-nozzles, shafting)
- Gumeta, Gummi-Metal-Werk H. Maes GmbH, Rehlingen-Siersburg (rubber bearings for propeller-shafts)
- Fenestra, Slovakia (window and door systems)
- Makrowin, Slovakia (window and door systems)
- JAF Holz, Slovakia (wood supplier)
- Doerken, Slovakia
- Rockwool, Slovakia (thermal insulations)
- Wamak, Slovakia (heat pumps)
- Atrea, Czech Republic (ventilation systems)
- Bioclar, Slovakia (wastewater treatment plants)
- Kimall, Slovakia (structural systems)