Cassette2go was asking about the General, michiel posted these several years ago, found in the forum reader. Anytime there's a widely used name, it's difficult to find any information.
Some more information on the Magnitolia Blog, you may have to translate. http://magnitolia.blogspot.com/2013/10/general-mg-345-rapor-mg-345.html
The address currently shows Fujitsu General as the owner, Fujitsu used to have a lot of electronics over here but they are a big company that does a lot of things. Some of you may remember the Fujitsu Ten Car Stereo Line.