Contraves was a company formed by a merger between a division of Owens, and part or all of a Swiss company known as Goerz - whether this was just the Goerz division of some larger Kern company, I don't know. They seem to have been a merger of the Brashear and Goerz businesses, both long-standing companies in optics. Contraves existed from the 1970s into the 2000s mostly in the aerospace/defense industry. They made your cinetheodolites, and hardware for satellite communications, but another aspect of their business was telescopes. I know that they built the 3.7-m telescope for the Air Force that is on on Haleakala (Maui, Hawaii), and that they polished the 8-m mirror for the Japanese Subaru telescope on Mauna Kea. They may have built other instruments in that time period (I mean, if a company can build an optical shop large enough to polish an 8-meter mirror, clearly it is building other things, the question is how many of the projects are openly acknowledged).
The thing with the aerospace industry is that names and business units get passed around like hot potatoes. Contraves itself seems to have been created by a spinning-off of two units, and by the end of its run in the early 2000s it was a much smaller business owned by yet another defense contractor, that got sold to some local Pittsburgh investors and realigned into a different business. Were the part of Kern that turned into Contraves, and the part of Kern that made Dagors and was linked to Schneider, related? I don't know. I don't know who if anyone owns the trademarks like "Dagor" that once belonged to Goerz.