HP 2100 ER - Manual (Page 4)

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Printing History
This guide is the first edition of all included material. The guide printing
date and part number indicate the current edition. The printing date
changes when a new edition is printed. (Minor corrections and updates
incorporated at reprint do not change this date.)
Edition 1: July 1998
Edition 2: December 1998: Added textual enhancements and
revised illustrations
Edition 3: February 2000: Added references to magneto-optical
devices and revised illustrations