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This series comprises the records of private telephone companies which were taken over by the Post Office in 1912. It consists of items relating to individual companies, National Telephone Company rules and instructions, staff related records, agreements, judicial proceedings, valuation of assets and a collection of early telephone directories.

This series consists of a collection of arbitration cases between the Postmaster General and private telegraph companies; memoranda by heads of Post Office departments and their correspondence, records of the Central Telegraph Office, lighthouses and lightvessels, circuits and codes, mobile facilities for telegraphs at race meetings and special events; Letters Patent taken out by inventors and specifications of inventions.