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Light intensity controller for optical systems. Produced by the famous company "Busch" of Rathenow in Brandenburg, a manufacturer of optics, binoculars, etc.etc. In particular, the instrument could be applied to all those optical system, including MG 34 and 42 and trenches binoculars and telescopes, which provided night vision. The instrument is complete and original in all its parts. Working. Rare.
