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The Scientific Apparatus Division of AEI, part of its Electronics Group
Presumably incorporated the Scientific and Testing Equipment work of Metrovicks
1966 AEI Scientific Apparatus was a leader in the design of mass spectrometers and electron microscopes
1969 The Division had 2 factories, at Manchester and Harlow; it was considered as a target for acquisition by Rank
1969 GEC decided against selling the Division to Rank and instead formed it as a trading company called AEI Scientific Apparatus which was expected to grow fast
1969 AEI Scientific Apparatus, in its factory at Harlow, completed the first commercial million-volt electron microscope to be built in Europe for delivery to the Atomic Energy Research Establishment at Harwall
1974 Part of GEC-Marconi Electronics