Image / de Forest audion triode, c. 1922

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Title: de Forest audion triode, c. 1922
Creator: Marconi Company
Contributing Institution: History San Jose Research Library
Collection: History San Jose Online Catalog
Rights Information: Please contact the contributing institution for more information regarding the copyright status of this object.
Description: Brass base, 4-pin. The base is stamped on one side, "De Forest Audion U.S. Patent Nos. 841387-879532 Sold Only For Amateur Experimental Use." The other side bears the Marconi logo and Fleming patent number. E.R. 530631 stamped on glass.
Type: image
Identifier: F8DDC8DC-4614-4B22-B1E7-930468465520
2003-1-837
Subject: Vacuum-tubes
Diodes
Nineteen tens
Radio--Transmitters and transmission
Nineteen twenties
Amateur radio stations
Audion
De Forest, Lee

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