[OKDXA] Submitted For Your Amusement:

[AC5UP]

Thought these two were particularly interesting...

http://www.stevenjohnson.com/ads/rca-radio-service-news3-1945.pdf
(Hyper frequency techniques above 750 mc's! Check out the mil-spec 
cheesecake...!)

http://www.stevenjohnson.com/ads/pics/teledyne-popular_raido-05-1924.jpg
(If you invested $190 in 1924, today it would be worth...? Zero. You got 
wiped out in 1929. D'oh!)

Here's the source page: http://www.stevenjohnson.com/ads/