"I don't know why I write science fiction. The voices in my head told me to!"
I wonder if he invented this one; another failure to file patent. You can see how you might think of it; anyone familiar with machine shops or labs with compressed air know that compressed air is often used to dry materials.
According to Denis Gagnon, president of Exel Dryer, "the basic hand dryer was invented in 1948 and has gone virtually unchanged ever since." It may have been patented by someone in 1948, but Robert Heinlein wrote about it in 1940.
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