>>4459031
Right manuals exist. But i think that "Elektromechanik und Elektronik" is just a sort of title or addon and not actually part of the name. Or at least i have never seen anything besides "& Co. KG" come after "GmbH".
Its "Kaiser Fototechnik GmbH & Co. KG" and not "Kaiser GmbH & Co. KG Fototechnik". Its the same as all LLCs i have seen also officially ending in "LLC". What would be reason to write down the rough address instead of the full company name on the product? If it were actually part of the name they would have to. The patents would refer to it with "Elektromechanik und Elektronik" also otherwise.

Their last patent was in 1992 however which matches up with the time window you gave although a billion photography companies went under in that time. I'll search for more info tomorrow. Maybe a new perspective will help.