It sems to be obvious that the name "RAULER" was built of first name of RAUL Gozzi and the first two letters of Ernesto Colnagos first name, hence "RAUL ER" resp "RAULER"; a project of Raul & Ernesto and somehow some kind of a pretty unknown sub-brand of Colnago, like COLNER was.
!! As shown on some frames (e.g. decals on the left chain stay) the name RAULER is a combination of the two first names of the Gozzi Brothers: RAUL e R(eclus) Gozzi hence "RAULeR" resp. "RAULER". !!

It's told that at least one of the Gozzi Bros. (Raul?) worked for Ernesto Colnago before they started their own business by eo the 70's. While But these facts about the relationship with Ernesto Colnago are a little uncertain.

According to some other rumors in the www....
... the Rauler company became one of the top (contract) builders for Colnago and did a lot of the pantographyic work for them as well.

I estimated the opening and closing years of the Rauler Inc. based on the info below and on the last website update of rauler.it (archived on archive.org) in 2014.

Thanks for a review, further info and/or confirmation!