Wow Cory, those are cool! Especially the fold down models.
BTW, those are called the "Hillsborough"
There is a promotional film about them posted on the Prelinger Archives:
http://www.archive.org/movies/detail...ectionid=08447
Don't know if this link will work but give it a try, otherwise go here:
http://www.archive.org/movies/prelinger.php
and search for RCA
Eric