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Applications of thin magnetic films in random-access memories of digital computing systems have received considerable attention recently because of their potential speed advantages. The necessity for using hundreds of thousands, or even millions of these elements in a single computer dictates that careful attention be given to cost. This paper describes the production design package for a thin-film, 20 000-word rod memory array that offers nanosecond switching and reasonable fabricating cost. Rod fabrication and solenoid plane fabrication are discussed in Sections II and III. Solenoid plane assembly, rod insertion, electrical connections, and final assembly are described in Sections IV through VII, respectively.