| X | 10b | oil refinery | ||||
| X | 35b | oil refinery | ||||
| X | 40b | oil refinery | ||||
| X | 50b | oil refinery | ||||
| X | 80b | oil refinery |
| - | 55b | oil derricks | ||||
| - | 70b | oil derricks | ||||
| - | 90b | oil derricks | ||||
| - | 500b | oil derricks | ||||
| - | 1000b | oil derricks |
| - | 1b | |||||
| - | 5b | ol |
| - | 5b | grn | Posthorn overprint Bs 5 DS 21-IV-55 on Bs 3 |
| - | 5b | bl | plane over airport |
| - | 10b | airplanes |