Ffeil BOX 14/13-14. - Two files containing details of experiments on Artificial Cables and Duplex Signalling, 1923-1927. Xerox copies of extracts from the records ...,

Two files containing details of experiments on Artificial Cables and Duplex Signalling, 1923-1927. Xerox copies of extracts from the records of the Eastern Telegraph Co. relating to Ben Davies's patents, salary, expenses, employment record and retirement, 1902-1929. (E.T.C. Minute Book', no. 17, Indexes to E.T.C. Minute Books, nos. 11, 12, 17, Common Seal Book, no. 13, and Eng./Staff File). The call number of the copies is NLW Facsimile 388.