Alle Firmen mit dem Anfangsbuchstaben I
- Ing. Wahl Christian
- Ing. Wahlmüller Stefan
- Ing. Walch Ludwig
- Ing. Walch Stefan Alexander
- Ing. Wald Egon Ermin
- Ing. Walder Lukas Georg
- Ing. Walder Stefan Wolfgang
- Ing. Waldhart Gerold Hannes
- Ing. Waldherr Stefan
- Ing. Waldhuber Gerald
- Ing. Waldmüller Alexander Georg
- Ing. Waldner Manuel Erwin
- Ing. Walker Bernhard
- Ing. Wallner Armin
- Ing. Wallner Beteiligungs GmbH
- Ing. Wallner Kurt Michael
- Ing. Walser Gerhard
- Ing. Waltenberger Andreas
- Ing. Walter Haas Laborelektronik GmbH
- Ing. Walter Hahn Bäckerei- und Konditoreitechnik GmbH
- Ing. Walter Heinz
- Ing. Walter Helmut
- Ing. Walter Herbert
- Ing. Walter Huber KG
- Ing. Walter Kalcher
- Ing. Walter Michael Siegfried
- Ing. Walter Mölzer
- Ing. Walter Otto
- Ing. Walter Steingreß-Registrier- kassencenter Gesellschaft m.b.H.
- Ing. Walter Streit Baugesellschaft m.b.H.
- Ing. Walter Strobl Gesellschaft m.b.H.
- Ing. Walter Wallauch | Effectiva Partner
- Ing. Walther Neuhardt technisches Büro e.U.
- Ing. Waltl Josef
- Ing. Waltle Markus
- Ing. Walzl Günther Adolf
- Ing. Wandelnig Max
- Ing. Wanggo-Mayer Ulrike Maria
- Ing. Wappel Thomas
- Ing. Warenits Karl Stefan
- Ing. Wartelsteiner Johann
- Ing. Wartinger Jürgen
- Ing. Waß Andreas
- Ing. Weber Andreas
- Ing. Weber Andreas
- Ing. Weber Helmut Alexander
- Ing. Weber Mirko
- Ing. Weber Norbert Silvio
- Ing. Weber Roland
- Ing. Weber Stephan
- Ing. Wechner Thomas Johannes Franz
- Ing. Wecht Thomas
- Ing. Wegerer Florian
- Ing. Wegmann Florian
- Ing. Wegscheider Brandschutzberatungs KG
- Ing. Wegscheider Georg
- Ing. Wehinger Karl-Heinz
- Ing. Weichselbaumer Hans Peter
- Ing. Weichselbaumer Martin
- Ing. Weidinger Heribert
- Ing. Weidinger Johann
- Ing. Weidlinger Ferdinand
- Ing. Weigand-Berger Angelika - Rauchfangkehrermeister
- Ing. Weigerstorfer Walter
- Ing. Weigl Christian
- Ing. Weigl Roman
- Ing. Weihs Harald
- Ing. Weihs Heinrich
- Ing. Weilbuchner Wolfgang
- Ing. Weilguni Patrick
- Ing. Weilguny Günter
- Ing. Weilinger e.U.
- Ing. Weingartner Franz
- Ing. Weingartner Michael
- Ing. Weingerl Karl
- Ing. Weingraber Rainer
- Ing. Weingril Wolfgang Ulrich
- Ing. Weinhappl Johannes
- Ing. Weinhofer Christian
- Ing. Weinhofer Patrick