Artifact Details Title Logic - Pluggable Unit Catalog Number 102712275 Type Still image Description B&W image of an early pluggable unit. It has 6 tubes with associated components. Recto bottom : " NR 3138-Box5 #6" Identifying Numbers #1688 Dimensions overall: 8 in x 10 in Category Identification photograph Credit Courtesy of Gwen Bell Lot Number X7413.2015