Perhaps almost members have seen this video.
With a very vintage look of 70's, shows National development of various appliances, not only related to audio.
Sightseeing is related to some mono's ... Altough markenting is not so good, it's clever enough to show the National's know-how about consumer market, and the wide spectrum of solutions they could produce.

http://www.youtube.com/watch?v=xZRh3qoVDCI