{{ #switch:
| =| ABS = Interval shelter| ABC = Underground interval shelter| PO = Small artillery work (Petit ouvrage)| POI = Small infantry work (Petit ouvrage - infantry)| GO = Large artillery work (Gros ouvrage)| GOI = Large infantry work (Gros ouvrage - infantry)| CA = Infantry casemate| CAA = Artillery casemate| OB = Artillery observatory| Data error}}