TitleIBM SSEC Vacuum tube and Relay
Dimensionsoverall: 8 in x 10 in
DescriptionB&W image of a vacuum tube and relay used in IBM SSEC. Vacuum tube has 7-43 188-5 on base.
Verso: Berenice Abbott Photograph 50 Commerce AStreet New York 14, N.Y. red stamp.
Top Figure 6a in pencil