I found some info about Roco's history
here (Google-translated from German to English).
From 1960s: Roco produced 'Minitanks': Model railways in H0 and 0 scale.
1966-2010 Production of N scale models.
From 2011 under the brand name Fleischmann.
Active Time / History:
The company 'Ing. Heinz Rössler' was founded 1960th
From 1970 Roco produced freight wagons for Minitrix.
1973 Takeover of the molds from the former company Rowa.
2002 family business was sold.
2005 bankruptcy filing. Rescue company was the newly founded Modelleisenbahn GmbH.
2006 Roco back on track producing N scale models. Modelleisenbahn GmbH re-released many N scale models as "new for 2006" with new car numbers with attractive pricing.
2010 Last time models were sold under Roco name. From 2011 Roco models are now sold, relatively unchanged, under the brand name Fleischmann.
NOTE: In the early years of military models'Minitanks' and model trains were produced in the gauges H0 and 0, mainly for the American market.