"In 1970 I found little difficulty staying 30 years ahead of the man in the street, and now I find it difficult to stay 18 months ahead of the man on the street."
As far as I know, Gernsback was the first person to formally describe a device using bone conduction to transmit sound; he received a patent in 1924.
Here are the figures that accompanied Gernsback's 1923 patent filing for the Acoustic Apparatus:
See the original patent filing (pdf).
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