 | THERMAX AS | 984757514 | TØNSBERG |
| THERMICA AS | 997933273 | LIER |
| THERMO CONTROL AS | 979439334 | NORDRE FOLLO |
| THERMO CONTROL NORD AS | 846202552 | HARSTAD |
| THE WAGONSHED PROJECT AS | 928079325 | KONGSBERG |
| TH INDUSTRIBYGG AS | 927387344 | MOSS |
| THINGBØ RØRSERVICE AS | 927410613 | SANDNES |
| THINGSTAD BJØRN | 971653493 | ÅMOT |
| TH. JOHANSEN & SØNNER AS | 935721652 | HAMAR |
| TH KOLBEINSEN INSTALLASJON AS | 976038266 | KARMØY |
| TH MASKIN AS | 998557976 | HEMSEDAL |
| THOEN MASKIN AS | 995352605 | ÅL |
| T HOLAND MASKIN AS | 980927539 | EIGERSUND |
| T HOLMEIDE & SØNNER AS ENTREPRENØRFORRETNING | 944229264 | LIER |
| THOMAS DALEN | 994550284 | STRAND |
| THOMASSEN ARKITEKTKONTOR AS | 963092229 | OSLO |
| THOMASSEN BYGG AS | 991281959 | SALANGEN |
| THOMASSEN RØR AS | 818952872 | LILLESAND |
| THON & CO AS | 935062691 | MODUM |
| THON MASKIN AS | 925389269 | NORD-AURDAL |
| THORALF MYHRE AS | 917871167 | SANDNES |
| THORBJØRNSEN RØR AS | 929066014 | NORDRE FOLLO |
| THORE KNUTSEN MASKIN OG TRANSPORT AS | 991327495 | TYSVÆR |
| THORE LUNDHAGEN GRAVING/TRANSPORT | 992240911 | LILLESTRØM |
| THORE MAGNUSSEN OG SØNN AS | 975950824 | VESTVÅGØY |
| THORENDAHL AS | 963265433 | OSLO |
| THORGERSEN BYGG OG BETONG | 988084883 | KARMØY |
| THOR GJUL AS | 989995332 | ØRLAND |
| THOR HARTVIG LUNDE | 989503693 | TVEDESTRAND |
| THOR HÅVARD TORP GRAVING & TRANSPORT | 970938699 | FREDRIKSTAD |
| THØRING & SØNNER AS | 933396347 | LESJA |
| THOR MAGNE HANSEN & SØNN AS | 985826617 | LYNGDAL |
| THORMODSÆTER ENTREPRENØR AS | 993578258 | KVINNHERAD |
| THOR MYRVANG GRAVEFIRMA AS | 919798726 | RINGERIKE |
| THORNSTRÖM BROOKFIELD ARKITEKTER AS | 929631897 | BERGEN |
| THORP INGE | 970020136 | BÆRUM |
| THORRUD PROSJEKT AS | 988865656 | HOLMESTRAND |
| THORSEN & MARCUSSEN AS | 944225633 | FÆRDER |
| THORSHAUG RØR AS | 931032399 | LILLESTRØM |
| THORSNES BYGG TB AS | 926940791 | OSLO |
| THOR STEINAR BYGGTJENESTER AS | 979713126 | STAVANGER |
| THORSTEINSEN ENTREPRENØR AS | 816119812 | BERGEN |
| THORVALD HANSEN AS | 895877972 | GRIMSTAD |
| THORVALDSEN OG HARLEM RØR AS | 930841757 | FREDRIKSTAD |
| THOR WIKE & Co AS | 960957334 | HOLMESTRAND |
| TH.S.ENTREPRENØR AS | 923185844 | LILLESTRØM |
| THUNBERG ENTREPRENØR AS | 913827139 | LARVIK |
| THUVE'N ANLEGG & BANE AS | 913714377 | STANGE |
| THV AS | 997448227 | HÆGEBOSTAD |
| T. I. LARSEN RØRLEGGER AS | 991445404 | KRISTIANSAND |