Patent US879532 - Lee de Forest:
https://worldwide.espacenet.com/publicationDetails/originalDocument?CC=US&NR=879532A&KC=A&FT=D&ND=3&date=19080218&DB=EPODOC&locale=en_EP
The first ever amplifier and possibly the best ever made.
It still sends to the cleaners or for tea possibly anything else.
The grid is at space potemtial left to biased by nature itself.
How many hundred years was Lee de Forest ahead of his time?
See also patent US1343717 by Hanson (the first hearing aid amplifier?)
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