Download:
deforest_three_element_vacuum.jpg
This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
DeForest three element vacuum tube c. Bennington Museum Bennington VT DSC. en Exhibit in the Bennington Museum Bennington Vermont USA Photography was permitted in the museum without restriction own Daderot other versions cczero Collections of the Bennington Museum Audion