Inventions Which Did Not Succeed

Emailed to me from another humor list (The Funnies)
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*The water-proof towel
*Glow in the dark sunglasses
*Submarine screen doors
*A book on how to read
*Inflatable dart boards
*A dictionary index
*Mechanical pencil sharpeners
*Powdered water
*Waterproof tea bags
*The helicopter ejector seat
*The cordless extension cord