Correspondence, memoranda, etc. regarding meetings and projects, mainly on Electronic Telegraph Switching, and patents on 'Memory Systems' arising therefrom (1962). Some briefer correspondence on Parcel Conveyor Control (1964) is included.

Includes 2 reports by Strachey, 7 March 1962: 'Electronic Telegraph Switching. Draft Proposals' and 'Parallel Access to a Drum'. November 1961-November 1964.

Fuller correspondence, drafts and information on Patents was kept in a separate file