Links:
[1] http://www.wwdmag.com/category/topical/monitoring/communications-equipment-systems
[2] http://www.wwdmag.com/category/company-type/manufacturer
[3] http://www.wwdmag.com/category/topical/monitoring/data-acquisition-systems
[4] http://www.wwdmag.com/category/topical/monitoring/data-distributed-process-control
[5] http://www.wwdmag.com/category/topical/automation/process-controllers