1970s comics ads: The anti-gravity device!

Hey everyone! Can you believe we've all been sitting on our asses while the greatest invention of the last 500 years was discovered over forty years ago?? That's right -- I just found this ad in yet another early 1970s Iron Man issue (#49 from 1972, specifically):

Can you imagine that? For a crummy quarter and a dime, an ANTI-GRAVITY DEVICE can be yours!!

What's not generally known is that Tony Stark (Iron Man's alter-ego) created the thing! That's right -- and then he proved what a lousy capitalist he is by offering it to the public at large ... for a crummy 35 cents!

Sheesh.