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| MARTINSEN ANLEGG AS | 911736489 | NORD-AURDAL |
| MARTINSEN BAD & BOLIG AS | 918327967 | OSLO |
| MARTINSEN BETONG AS | 898197832 | MELHUS |
| MARTINSEN & STENSTAD BOLIGENTREPRENØR AS | 991408754 | BÆRUM |
| MASIV BYGG AS | 943612226 | KLEPP |
| MASKIN & EIENDOM AS | 912174115 | TROMSØ |
| MASKINENTREPRENØR EGIL ÅSTAD AS | 834715112 | EIDSVOLL |
| MASKIN ENTREPRENØREN AS | 833378732 | BERGEN |
| MASKINENTREPRENØR FJELLHEIM & SØNN AS | 988107379 | TVEDESTRAND |
| MASKINENTREPRENØR HÅKON ROGSTAD AS | 998397189 | RINGSAKER |
| MASKINENTREPRENØR HERBJØRN NILSSEN AS | 979710968 | TROMSØ |
| MASKINENTREPRENØR JIMMY NORE & SØNN AS | 984231512 | KINN |
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| MASKINENTREPRENØR KARSTEN MIKALSEN AS | 997091558 | FREDRIKSTAD |
| MASKINENTREPRENØR KNUT ROLANDSEN AS | 984283814 | RØST |
| MASKINENTREPRENØR KRISTIAN KRISTIANSEN AS | 982585058 | NARVIK |
| Maskinentreprenør Lobben & Skinstad A/S | 945856335 | ØVRE EIKER |
| MASKINENTREPRENØR MONAN AS | 922960690 | KRISTIANSAND |
| MASKINENTREPRENØR PER OTTO TANGEN AS | 990028567 | RINGERIKE |
| MASKIN ENTREPRENØR ROGER NÆRUM AS | 889568232 | SKIEN |
| MASKINENTREPRENØR RUNE HORVE | 992498218 | KRISTIANSAND |
| MASKINENTREPRENØR S. HAMMERSETH | 969410737 | KINN |
| MASKINENTREPRENØR SØLVE BOGEN | 914324637 | ØVRE EIKER |
| MASKINENTREPRENØR STIAN A. OLSEN AS | 918488588 | NANNESTAD |
| MASKINENTREPRENØR STIG KRISTIANSEN AS | 941835651 | TROMSØ |
| MASKINENTREPRENØR TOR GABRIELSEN AS | 982389836 | TROMSØ |
| MASKINENTREPRENØR TORMOD SEVERINSEN AS | 911987694 | TROMSØ |
| MASKINENTREPRENØR TRYGVE AASEN AS | 929052137 | SUNNFJORD |
| MASKINFIRMA ÅGE SIMONSEN & SØNN AS | 986550224 | ARENDAL |
| MASKINKRAFT AS | 977485576 | RINGSAKER |
| MASKIN OG UTEMILJØ AS | 987902817 | INDRE ØSTFOLD |
| MASKINSERVICE Arne Jørgen Bøhnsdalen | 980649121 | KONGSVINGER |
| MASKINSTYRING AS | 919720441 | RINGSAKER |
| MASKINTJENESTER AS | 996787028 | SKIEN |
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| MASTERBAD AS | 927209330 | OSLO |
| MASTER SEALING AS | 925353868 | VERDAL |
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| MATEC ØST AS | 998755255 | GRUE |
| MA TEK AS | 879582512 | SØR-VARANGER |
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| MATHISEN AS | 951648736 | RINGSAKER |
| MATHISEN BYGGRÅDGIVING | 991784691 | LARVIK |
| MATHISEN VVS AS | 911825120 | MOLDE |
| MATS ANDRE GJØEN | 925418439 | BJØRNAFJORDEN |
| MATS HUS AS | 967385816 | TANA |
| MAURA BYGG AS | 926038508 | NANNESTAD |