ANSWERS: 1
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Hand dryers were invented in 1948 for public restrooms. When a person placed their hands underneath the hand dryer it blew hot air that allowed people to dry their hands. With the invention of the hand dryer this minimized the use of paper towels.
Source:
Amercian School & University: Paper Trail
Invent Resources: Elelctric Hand Dryer Takes Step to Blast Paper Towel
Resource:
Air Blast by Robert Heinlein from Conventry
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