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| Keywords: SEACComputer 037.jpg Plug-in circuitry for computers was developed early in NBS computer research and has since been improved and repeatedly designed Later generations performing the signal-gating function are shown in the image in evolutionary order with the most recent in the foreground Held partially opened is a package using flexible supports and conductors Next to it are shown two contemporaneous modules characterized by use of connectors and wrap-around frames; one features printed circuitry Its descendants include foreground modules making connections at connective patterns on the printed circuit board others continuing the frame-and-connector approach and a single generation of a printed-circuit module using a different type of connector National Institute of Standards and Technology 1967-06-13 National Institute of Standards and Technology PD-USGov-NIST PD-USGov SEAC computer Vacuum tube devices Computer modules | ||||
