Before revision: It was followed by the Tandem Integrity NonStop line of lock-step fault tolerant computers, now defunct (not to be confused with the later and much different Hewlett-Packard Integrity product line extension).
After revision: It was followed by the Tandem Integrity NonStop line of lock-step fault-tolerant computers, now defunct (not to be confused with the later and much different Hewlett-Packard Integrity product line extension).