Image / Patent No. 841,387, device for amplifying feeble electric currents

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Title: Patent No. 841,387, device for amplifying feeble electric currents
Creator: Unknown
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: Photograph of Lee de Forest patent for Device for Amplifying Feeble Electrical Currents, No. 841,387, with the device on top of the patent for photograph. Patented January 15, 1907. On reverse, "Copy of photo obtained from George H. Clark" with Gerald F. J. Tyne's name and address stamp.
Type: image
Format: Black & White
Identifier: 88E84A35-D027-4DCC-91D6-116023578950
2003-59-274
Subject: Audion
Patents (LCSH)
Amplifiers, Vacuum-tube (LCSH)
Inventions
De Forest, Lee

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