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| Office Meier AG | Talstrasse 6 | 4900 Langenthal |
| Tel 062 919 27 00 | Fax 062 919 27 10 | www.officemeier.ch |
| Onyx Energie Mittelland | Waldhofstrasse 1 | 4901 Langenthal |
| Tel 062 919 21 21 | Fax 062 919 21 00 | mail@onyx-energie.ch |
| Oscar Richner HE Baumanagement + Consulting GmbH | Birkenweg 10 | 4900 Langenthal |
| Tel 062 923 24 40 |