"Well, it's like this. The story starts in 1915, when mankind discovered
sidebands. Now possessing this superior understanding of the AM signal,
radio scientists began to understand the implications of their discovery.
Soon afterwards, our old friends at Bell Labs, who have discovered
practically everything, developed a method for removing one of the sidebands
of an AM signal but retaining all the essential modulation components. As an
expert of that day supposedly said, "both sidebands are saying the same
thing" (Goodman, 1948). " From:
http://www.hamradiomarket.com/articles/SSBHistory.htm

I was born after 1915. I am supposing that in that time was possibility to
tune to the three different frequences.
Am I right?
S*