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RE: Memories of our childhood: Toys of the 1940's by @mevilkingdom
The slinky has very little intrinsic value until demonstrated.
If television had not come along about the same time, it would never have gotten anywhere.
Same with Post-it notes. Everyone at 3M loved them, but when they marketed them outside the company they were a complete flop. Until marketing started running adverts to show how you could use them.