﻿Essential Data Duplicator 4 (version 4.1)
(c) 1986 Utilico Microware

Essential Data Duplicator 4 Plus (version 4.8)
(c) 1987 Utilico Microware

(EDD 4 Plus uses a specially designed hardware card which works with your disk drives to back up disks by accurately copying the bits of data from each track)

The EDD 4/4+ programs on this disk were backed up with Snapshot Copykit

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-> http://www.cvxmelody.net/AppleUsersGroupSydneyAppleIIDiskCollection.htm