A system and method for process instrumentation and control equipment. The system including a paperless, microprocessor-based, panelboard recorder having built-in data acquisition functions, a mechanism for archiving data, and a variety of display types. Memory space is conserved by deriving...http://www.google.com/patents/US5757357?utm_source=gb-gplus-sharePatent US5757357 - Method and system for displaying digital data with zoom capability
