Numa-Logic NL-300 series control was a system of separate cards, with each card having a separate function (AND, OR, Flip-Flop, etc.) These cards were mounted in a rack and the "logic" was performed by connecting various gates and circuits of each card together using wire-wrapping techniques.
Manuals and other documentation is available at: http://www.pps2.com/communications/NL300.php (http://www.pps2.com/communications/NL300.php)
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