| Client name | City | Country |
|---|---|---|
| Sitech Services BV. | Geleen | Netherlands |
| SKL Engineering & Contracting GmbH | Hannover | Germany |
| SKL Engineering GmbH | Berlin | Germany |
| SKODA PRAHA Invest s.r.o. | Prag | Czech Republic |
| SKW Stickstoffwerke Piesteritz GmbH | Lutherstadt Wittenberg | Germany |
| Smardt OPK Chillers GmbH | Neckartailfingen | Germany |
| SMART INTERNATIONAL COMPANY FZE. | Dubai | United Arab Emirates |
| SMB Gesellschaft für | Nidda | Germany |
| SMS Siemag AG | Hilchenbach-Dahlbruch | Germany |
| SOCAR-Foster Wheeler Engineering LLC | Baku | |
| Softwarebüro Kersting | Dormagen | Germany |
| Soluciones integrales de Gestión S.A. | CABA | Argentina |
| Solvay Chemical GmbH | Bernburg | Germany |
| Solvay Chemicals GmbH | Rheinberg | Germany |
| Solvay Chlorovinyls GmbH | Rheinberg | Germany |
| Solvay GmbH | Bad Wimpfen a. N. | Germany |
| Solvay Infra Bad Hönningen GmbH | Bad Hönningen | Germany |
| SOLVAY S.A. | Bruxelles | Belgium |
| SOLVAY SA | Brüssel | Belgium |
| SOMAS Instrument AB | Säffle | Sweden |
| Sonatrach Raffineria Italiana S.r.l. con socio unico | Augusta | Italy |
| SPIE Controlec Engineering B.V. | Schiedam | Netherlands |
| SPIE Nederland B.V. | Breda | Netherlands |
| Spirax Sarco S.r.l. | Nova Milanese (MI) | Italy |
| Spraytech India | Thane | India |
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