Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Gruber Thomas
- Ing. Gruber Wilhelm Johannes
- Ing. Gruber-Veit Marlen
- Ing. Gruböck Christian
- Ing. Grätzhofer Martin
- Ing. Gröber Christoph Stefan
- Ing. Gröblinger Andreas
- Ing. Grössler Stefan
- Ing. Grübl Thomas
- Ing. Grüner Bertram
- Ing. Grünsteidl Manfred
- Ing. Grünstäudl Andreas
- Ing. Grüssinger Diana
- Ing. Gsandtner Henrieta
- Ing. Gschossmann Dominik
- Ing. Gschwandegger Romana
- Ing. Gschwent Gottfried
- Ing. Guanco Thomas
- Ing. Guem Markus Sebastian
- Ing. Gugg Eva-Maria
- Ing. Gugganig Hannes Josef
- Ing. Guggemos Horst
- Ing. Guggenberger Wilhelm
- Ing. Gugl Rene Mario
- Ing. Guidassoni Claudio
- Ing. Gumpold Peter Siegfried
- Ing. Gumpoldsberger Marvin
- Ing. Gunacker Erwin Leopold
- Ing. Gunic Sanjin
- Ing. Gunz Stefan
- Ing. Gurmann Gebäudetechnik GmbH
- Ing. Gurmann Holding GmbH
- Ing. Gurschler Michael Kurt
- Ing. Gustav Arthofer Beteiligung GmbH
- Ing. Gutmann Franz-Josef
- Ing. Gutmann Walter
- Ing. Gutmayer David
- Ing. Gutovnik Thomas
- Ing. Gutschi Joachim
- Ing. Gwihs Alexander
- Ing. Györög Erich
- Ing. Gärber Ewald
- Ing. Gärtner Andreas
- Ing. Göbel Franz
- Ing. Göbl Wolfgang
- Ing. Gödl Martin
- Ing. Gölles Reinhold
- Ing. Gölzner Franz
- Ing. Görz Stefan
- Ing. Göschl Bernhard Paul
- Ing. Göttfried Horst
- Ing. Götzendorfer Markus
- Ing. Günter Grüner GmbH
- Ing. Günter Krupitza e.U.
- Ing. Günter Michael
- Ing. Günter Vida - Sanitär- und Heizungstechnik, Gasgeräteservice und Reparaturdienst
- Ing. Günther Baschinger GmbH
- Ing. Günther Sillke
- Ing. Günther Uitz Beteiligungsgesellschaft m.b.H.
- Ing. Günther Zechmeister e.U.
- Ing. Gütl Andreas
- Ing. H. Wiesner Gesellschaft m.b.H.
- Ing. Haan Herbert Leopold
- Ing. Haas Johann Wenzel
- Ing. Haas Peter
- Ing. Haas Wolfgang Peter
- Ing. Haberl Alexander
- Ing. Haberl Georg Franz
- Ing. Haberl Harald
- Ing. Haberl Johannes
- Ing. Haberl Peter
- Ing. Haberle Christian
- Ing. Haberleitner Bernd
- Ing. Habersack Emmerich
- Ing. Habringer Jürgen
- Ing. Hacker Eduard
- Ing. Hackl Florian Andreas
- Ing. Hackl Jürgen Rene
- Ing. Hackl Martin
- Ing. Haderer Gerald