Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Haderer Manuel
- Ing. Hadinger Gerhard
- Ing. Hadinger Helmut
- Ing. Hadl Beteiligungs GmbH
- Ing. Hadrian Michael
- Ing. Hafner Manfred
- Ing. Hagelkruys Thomas Josef
- Ing. Hager Brigitte Daniela
- Ing. Hager Erwin
- Ing. Hager KG
- Ing. Hager Veronika
- Ing. Hagg Stefan
- Ing. Haggenmüller Johann
- Ing. Hagl Stefan Michael
- Ing. Hagn Julia Elisabeth
- Ing. Hahn Michael Johannes
- Ing. Haiberger Manfred
- Ing. Haider Andreas
- Ing. Haider Egon Alexander
- Ing. Haider Michael
- Ing. Haider-Punz Gudrun
- Ing. Haiderer Gerald
- Ing. Haidinger Johannes
- Ing. Hainbucher Franz Josef
- Ing. Haindl Herbert Erich
- Ing. Haindl Matthias
- Ing. Hainzl Gottfried
- Ing. Haizinger Lukas
- Ing. Hajdic Roland
- Ing. Hajek Fritz
- Ing. Halbartschlager Anton
- Ing. Halbartschlager und Hofmarcher Immobilienbesitz GmbH
- Ing. Halbartschlager und Hofmarcher Immobilienbesitz GmbH & Co KG
- Ing. Hallacyan Levon
- Ing. Haller Helmut
- Ing. Haller Jana
- Ing. Halper Patrick
- Ing. Halper Stefan
- Ing. Hameter Michael Helmut
- Ing. Hammer Stefan
- Ing. Hammerl Michael Leopold
- Ing. Hammerschmied Johannes
- Ing. Hanke Georg
- Ing. Hannes Federer - Kfz Federer
- Ing. Hannes Obkircher Projekt GmbH
- Ing. Hannes Schulz Nahwärmeversorgung e.U.
- Ing. Hanns Reinhard
- Ing. Hans & Helmut Bodner OG
- Ing. Hans Bodner Baugesellschaft m.b.H.
- Ing. Hans Brantner Holding GmbH
- Ing. Hans Diettrich
- Ing. Hans Drascher GmbH
- Ing. Hans Haugeneder
- Ing. Hans Kern Verwaltungs GmbH
- Ing. Hans Leitner Versicherungsmakler GmbH
- Ing. Hansel Sven
- Ing. Hanslik Christoph
- Ing. Hanzl Andreas Martin
- Ing. Happel Wolfgang
- Ing. Harald Lechner | INFINA Partner
- Ing. Harald Perschy
- Ing. Harald Setznagel GmbH
- Ing. Harbich Thomas
- Ing. Harg Jürgen Hans
- Ing. Hargassner Hubert
- Ing. Haring Christoph Manfred
- Ing. Harm Thomas Anton
- Ing. Harmer Leonhard
- Ing. Harringer Alexandra
- Ing. Hart Herbert
- Ing. Hartinger Richard Michael
- Ing. Hartl Andreas
- Ing. Hartl Fabian
- Ing. Hartl Wilfried
- Ing. Hartmann Arnold
- Ing. Hartner Markus Josef
- Ing. Hartung Felix
- Ing. Haselbacher Doris
- Ing. Haselbauer Harald
- Ing. Haselböck Peter