Article Published in Spring 1982 Zeiss Historica Society Journal
Author(s) Nicholas Grossman
See Page 5
A discussion on the use of special three letter codes to identify manufacturers of German war material (anything from airplanes to binoculars) and which codes applied to the various Zeiss companies at that time. Product designs were shared from one factory to another so if the Leitz factory were bombed out of action, Busch, Zeiss or another optical firm could also manufacture an identical optical product of that same design.
To go to the Journal itself, click on the year, 1981 in the first line above