Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Hradecky Christian
- Ing. Hrdina Bernhard Franz
- Ing. Hrdy Helmut
- Ing. Hristova Ani Antonova
- Ing. Huber Alfred
- Ing. Huber Dominik
- Ing. Huber Erich
- Ing. Huber Gerhard
- Ing. Huber GmbH
- Ing. Huber GmbH & Co KG
- Ing. Huber Herbert
- Ing. Huber Kurt
- Ing. Huber Michael
- Ing. Huber Robert
- Ing. Huber Robert
- Ing. Huber Walter
- Ing. Huber Walter Dieter
- Ing. Hubert Bachl-Hesse e.U.
- Ing. Hubert Hofmann KG
- Ing. Hubert Maletz Internationale Transporte GmbH
- Ing. Hubmann Andreas
- Ing. Hubmann Peter
- Ing. Huemer Julia
- Ing. Huemer Planungs- und Konstruktions- GmbH.
- Ing. Hummel Markus Rene
- Ing. Humpl Joachim Claus
- Ing. Hums Alfred
- Ing. Hunka Jennifer Erika
- Ing. Husic Dino
- Ing. Hussl Rainer
- Ing. Hutfless Wilhelm
- Ing. Hutter Markus
- Ing. Hutter Thomas
- Ing. Höbarth Andreas
- Ing. Hödl Martin Florian
- Ing. Höfer Erwin Alois
- Ing. Höfferer Bernhard
- Ing. Höfferl Stefan Karl
- Ing. Högl Gerhard
- Ing. Höhl Rudolf
- Ing. Höll Wolfgang
- Ing. Höllbacher Walter
- Ing. Höller Karin
- Ing. Höller Walter
- Ing. Höllerer Michael
- Ing. Höllhuber Maria Johanna
- Ing. Hölzl Bernhard
- Ing. Hölzl Johannes
- Ing. Hölzl Stefan
- Ing. Hörlendsberger Gerhard
- Ing. Hörmansdorfer, MSc Gerlinde
- Ing. Hörtenhuber Alfred Franz
- Ing. Hörtenhuber Benedikt Joseph
- Ing. Hörtnagl Johann
- Ing. Hösele Waltraud Maria
- Ing. Hösl Niklas Christian
- Ing. Hürner Jürgen
- Ing. Hütter Gudrun
- Ing. Hütter Peter
- Ing. Ibler Günther
- Ing. Iker Heinz
- Ing. Ilck-Kainbacher Jennifer
- Ing. Ilic Stefan
- Ing. Ilie Bogdan
- Ing. Ilker Boyacioglu
- Ing. Illigen Gerald
- Ing. Illmayr Daniel Stefan
- Ing. Ilsanker Mario
- Ing. Ilse Bittermann GmbH
- Ing. Imitzer Peter
- Ing. Immler Andreas
- Ing. Immler Helmut
- Ing. Imre Christian
- Ing. Ing. Gruber Markus
- Ing. Ingo Dirnberger Trauerwaren
- Ing. Irk Vera
- Ing. Irzl Andreas
- Ing. Isele Juliana
- ING. ISMAT T. MASRI PRIVATSTIFTUNG
- Ing. J. Hiller Gesellschaft m.b.H.