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 | | Peter Gross Bau Holding GmbH | Frankfurt am Main, Stuttgart, St. Ingbert |
 | | Hays – Working for your tomorrow | Mainz |
 | | WOLFF & MÜLLER Government Services GmbH & Co. KG | Stuttgart |
![Logo]() | | | Bielefeld |
 | | Willi Meyer Bauunternehmen GmbH | Berlin |
 | | STRABAG AG | Landkreise Neustadt/Aisch, Bad Windsheim, Ansbach |
 | | Ed. Züblin AG | Hamburg |
 | | HOCHTIEF Infrastructure GmbH | Essen |
 | | Ed. Züblin AG | Dortmund |
 | | Ed. Züblin AG | Brandenburg |
 | | Drees & Sommer SE | Berlin, Mannheim |
 | | Drees & Sommer SE | Frankfurt am Main, München, Stuttgart, Köln, Hamburg, Berlin |
 | | STRABAG AG | Seddiner See |
 | | Ed. Züblin AG | Frankfurt am Main |
 | | Drees & Sommer SE | Leipzig |