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| PRO INVENIA AS | 993404381 | TRONDHEIM |
| PROJEKT PLANUNG AS | 964105944 | OSLO |
| PROKLIMA CONSULTING AS | 924712538 | ASKER |
| PROLED AS | 924914831 | STORD |
| PROMATECH AS | 991933182 | BØMLO |
| PROMO ENTREPRENØR AS | 921217641 | OSLO |
| PROMOSTAL AS | 817317812 | DRAMMEN |
| PRO PARTNERS AS | 919857013 | OSLO |
| PRO-PIPE NORWAY AS | 891847122 | DRAMMEN |
| PROPLAN BYGG AS | 915332870 | SKAUN |
| PROPOINT SURVEY AS | 988912859 | BÆRUM |
| PROREF AS | 931465457 | RÆLINGEN |
| PRORIV AS | 832799742 | OSLO |
| PRORØR AS | 923116702 | TRONDHEIM |
| PRORØRSERVICE AS | 929054156 | OSLO |
| PROSJEKTBYGG AS | 966768673 | HERØY (MØRE OG ROMSDAL) |
| PROSJEKT & ENØK PARTNER AS | 996048616 | TØNSBERG |
| PROSJEKTFORM AS | 999156185 | TINN |
| PROSJEKTGRUPPEN AS | 993808415 | KRISTIANSAND |
| PROSJEKTIL AS | 982314097 | STAVANGER |
| PROSJEKTIL KONSTRUKSJON AS | 979459653 | STAVANGER |
| PROSJEKT KONSULT AS | 956435226 | HAUGESUND |
| PROSJEKTKONTROLL AS | 932041367 | SULA |
| PROSJEKTMESTER AS | 994093312 | OSLO |
| PROSJEKTRÅD INNLANDET AS | 963481519 | KONGSVINGER |
| PROSJEKTSTYRING VEST AS | 990353913 | ASKØY |
| Prosjekt Systemer AS | 936217494 | GLOPPEN |
| PROSJEKTUTVIKLING MIDT-NORGE AS | 943317739 | TRONDHEIM |
| PROTAKST KIRKENES AS | 928887847 | SØR-VARANGER |
| PROTAN ENTREPRENØR AS | 983386393 | LIER |
| PROTAN ENTREPRENØR MIDT-NORGE AS | 914613922 | TRONDHEIM |
| PROTAN TAKSERVICE AS | 977102499 | ALTA |
| PRO-TAX AS | 833356062 | MOSS |
| PROTAX ENTREPRENØR AS | 930379433 | OSLO |
| PROTEKNO AS | 997971558 | TØNSBERG |
| PROTEKS HATLESTAD | 932001284 | BERGEN |
| PROTEK VVS AS | 933804127 | TRONDHEIM |
| PROTERM AS | 997299175 | OSLO |
| PROTOM BYGG AS | 999537111 | ÅS |
| PRO TOTALBYGG AS | 886119372 | OSLO |
| PROVENO AS | 927566311 | TRONDHEIM |
| PS ANLEGG AS | 912561798 | GRIMSTAD |
| P S HÅLAND RØR AS | 980926826 | TIME |
| PSLAND AS | 926375474 | BERGEN |
| PSS RØRLEGGERSERVICE AS | 933259390 | OSLO |
| PSV ELEKTRO AS | 920753183 | ULLENSAKER |
| PSW POWER & AUTOMATION AS | 982574145 | ØYGARDEN |
| PTG KULDETEKNISK AS | 986165460 | TROMSØ |
| PTG MULTI KULDE AS | 979843445 | BODØ |