This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
Grau, a German manufacturer, makes high-end, very large capacity
mixed-media autochangers known as the ABBA series, targetted I believe
primarily at the IBM mainframe market. (rdv,94/11/7)
Bought by EMASS, see http://www.emass.com. They support 3480, D-2, MO,
VHS, DLT, 8mm all in one robot, so they renamed the autochanger series
the AML, Automated Mixed-Media Libraries.
 
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