Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Jaindl Alexandra
- Ing. Jaksch GmbH
- Ing. Jambor Helmut
- Ing. Jamnig Judith
- Ing. Janda Roland
- Ing. Jandrinitsch Bernhard Ernst
- Ing. Jandrisits Martin
- Ing. Janecka Milan
- Ing. Janicijevic Danijel
- Ing. Jantschitsch Thomas
- Ing. Janusko Helmut
- Ing. Janvier Thomas Paul
- Ing. Jaritz Markus
- Ing. Jarolim Reinhold
- Ing. Jasper Sek
- Ing. Jauernik Christian
- Ing. Jauk Andreas
- Ing. Jauk Gregor Johann
- Ing. Jauker Erhard
- Ing. Jautz Manfred
- Ing. Jaworsky Michael
- Ing. Jedinger Gerold
- Ing. Jell Susanne Renate Elisabeth
- Ing. Jernej Martina
- Ing. Jesche Michael
- Ing. Jesenko Patrick
- Ing. Jetzinger Herbert
- Ing. Jindra Thomas Norbert
- Ing. Jiras Erich
- Ing. Joachim C. Humpl MSc
- Ing. Joachimbauer Josef Franz
- Ing. Johann Astner Martina Astner Gesellschaft bürgerichen Rechts
- Ing. Johann Haderer, MBA I INFINA Partner
- Ing. Johann Hohenegger - Markisen - Sonnenschutz - Terrassendächer
- Ing. Johann Huf GmbH
- Ing. Johann Kierein u. Rudolf Webel Gesellschaft m.b.H.
- Ing. Johann Lehner KG
- Ing. Johann Löcker, Zimmerei und Sägewerk, 8071 Hausmannstätten 29
- Ing. Johann Neßwald
- Ing. Johann Schlusche Beteiligungsholding GmbH
- Ing. Johann Trimmel, Zimmerei
- Ing. Johannes Böhm Installationen GmbH
- Ing. Johannes Fegerl
- Ing. Johannes Fischer Baugewerbe GmbH
- Ing. Johannes Fluckinger
- Ing. Johannes Haller e.U.
- Ing. Johannes Schneider Gesellschaft m.b.H.
- Ing. Jokesch Helmut
- Ing. Jonas Michael
- Ing. Jordak Michael
- Ing. Joscak Matus
- Ing. Josef halter GmbH & Co KG
- Ing. Josef Hutterer GmbH
- Ing. Josef Koch Zimmerei- gesellschaft m.b.H.
- Ing. Josef Kotzinger Holding GmbH
- Ing. Josef Pacher GmbH
- Ing. Josef Perkovic GesmbH
- Ing. Josef Riegler Verpackungstechnik GmbH
- Ing. Josef Riegler Verpackungstechnik GmbH & Co KG
- Ing. Josef Stanitz
- Ing. Josef Winkler Gesellschaft m.b.H.
- Ing. Jungreithmeier Johannes
- Ing. Jungwirth Markus
- Ing. Jurkowski Joachim Manfred
- Ing. Jurnecka Peter
- Ing. Jäger Michael Bartholomäus
- Ing. Jägersberger Manfred
- Ing. Jöbstl Rupert
- Ing. Jöbstl Wolfgang
- Ing. Jölli Lucas
- Ing. Jörg Hans Jürgen
- Ing. Jürgen Fischer
- Ing. Jürgen Heiligenbrunner KG
- Ing. Jürgen Manschein e.U.
- Ing. Jürgen Pfalz
- Ing. Kabusch Robert
- Ing. Kafeder Andreas
- Ing. Kager Martin
- Ing. Kahles Peter
- Ing. Kahr Manfred