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This section seems to be about historical and proprietary equipment, far removed from the process control mainstream use. I propose deleting this to prevent confusion. Dougsim (talk) 18:46, 4 October 2016 (UTC)[reply]
Process control instrumentation is no more contemporary than its use for remote radio station control. It's near-obsolete for everything now, including instrumentation. So this should stay. Andy Dingley (talk) 20:37, 4 October 2016 (UTC)[reply]
Many things are both obsolete, yet still in use as legacies. Current loop (a single low-bandwidth signal per copper wire!) is hardly the choice for new work. Andy Dingley (talk) 22:39, 4 October 2016 (UTC)[reply]
