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The NORD-20 was a smaller, architecturally compatible version of the NORD-10, for use in OEM and process control systems.
According to the 16th Aug 1973 issue of 'Computing Magazine', the NORD-20 was introduced in 1973. But Oslo Museum has a picture of the NORD-20 which is dated October 1971, and it was probably introduced commercially in 1972, i.e. before the NORD-10.