Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Resl Autohaus Ges.m.b.H & Co KG
- Ing. Resl Autohaus GmbH
- Ing. Resl Helmut
- Ing. Rettenbacher Bernhard
- Ing. Reumiller Christine
- Ing. Rezac Harald Gerold
- Ing. Ribarich Herbert
- Ing. Richard Blaha GesmbH
- Ing. Richard Kuppek e.U.
- Ing. Richard Rambacher Dachdecker- und Zimmerei GmbH
- Ing. Richard Wachter BSc
- Ing. Richter Ernst
- Ing. Riedelmayer Ewald Adolf Leopold
- Ing. Rieder Günther
- Ing. Rieder InstallationsgesmbH
- Ing. Rieder Marco
- Ing. Rieder Mario
- Ing. Rieder Stefan Alexander
- Ing. Riedl Bernhard
- Ing. Riedl Markus
- Ing. Riedl Michael
- Ing. Riedler Martin
- Ing. Rieger Billy
- Ing. Rieger Georg Heinrich
- Ing. Riegler Christian Josef Herbert
- Ing. Riegler Johann Günter
- Ing. Riegler Jürgen
- Ing. Rienessl Thomas Peter
- Ing. Riepl Irmtraud
- Ing. Riesemann GmbH
- Ing. Riesenhuber Karl
- Ing. Rigger Christoph Maximilian
- Ing. Rimpler Claus
- Ing. Ringseis Georg
- Ing. Rinner Michael Josef
- Ing. Rinner Patrick R.
- Ing. Rinnerthaler Markus
- Ing. Rist Michael
- Ing. Ritter Arnold Alois Erich
- Ing. Ritter Gerhard
- Ing. Rizvic Kenan
- Ing. Robatsch Werner
- Ing. Robert Augeneder GmbH
- Ing. Robert Kutschera Bau
- Ing. Robert Lechner GmbH
- Ing. Robert Schunker - Daten- und Medientechnik
- Ing. Robert Trenkwalder - Ingenieurbüro für Maschinenbau
- Ing. Robert Winkler GmbH
- Ing. Robert Winter Klima & Lüftungssysteme
- Ing. Rohan Harald
- Ing. Roher Georg Johannes
- Ing. Rohm Gregor
- Ing. Rohr Michael
- Ing. Roitinger Georg
- Ing. Roland Kretschmer Baumeister u Zimmermeister GmbH
- Ing. Roland Wiplinger GmbH
- Ing. Roman Buchta e.U.
- Ing. Roman Gottschlich - Stahlhandel
- Ing. Roman Koselsky e.U.
- Ing. Roman Strolz | Möbel- und Innenausbau
- Ing. Rommer Peter
- Ing. Romski Edward
- Ing. Ronald Reumann
- Ing. Rosenauer Peter Andreas
- Ing. Rosenbaum Wolfgang Erich
- Ing. Rosenberger Manfred
- Ing. Rosenkranz Manuel Rudolf
- Ing. Rosian Meinrad
- Ing. Rossmüller Gerald Frank
- Ing. Rosteck Wolfgang
- Ing. Roth Franz
- Ing. Roth Herbert
- Ing. Roth Josef
- Ing. Rothbart Frank
- Ing. Rotheneder Thomas
- Ing. Rothwangl Peter
- Ing. Rotschne Manfred
- Ing. Rubin Christian Andreas
- Ing. Ruckhofer Gregor
- Ing. Rudlstorfer Dieter