Industria Metallurgica Dimosil Ltda is/was based in São Paulo. It was certainly in business in 1994, and may still be to this day. Dimosil appear to have manufactured a wide range of pressed steel products for a number of different markets. The word ‘bathroom’ seems to appear regularly in the Portuguese text describing their activities.
I have only ever seen two different models of Dimosil derailleur - the models in this collection. The first model is a copy of a SunTour Honor. The second model is broadly a copy of a Shimano Skylark/Tourney.