| Ab 2016 | FD Electric S.A.
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| Ab 2013 | WAGNER Facility Management S.A.
Chauffage - Sanitaire Schmit Nico S.à.r.l
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| Ab 2012 | WAGNER Building Systems S.A.
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| Ab 2011 | C.T.T.L S.A.
WAGNER Management S.A. / WAGNER Gruppe
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| 2002 - 2011 | Paul Wagner et Fils S.A. / Imtech (L)
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