The Post Office Electrical Engineers' Journal

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See also

References

  1. ↑ The Post Office Electrical Engineers' Journal, Vol. 38 No. 4, January 1946
  2. ↑ The Post Office Electrical Engineers' Journal, Vol. 49 No. 4, January 1957
  3. ↑ The Post Office Electrical Engineers' Journal, Vol. 51 No. 4, January 1959
  4. ↑ How the Secret Telephone War Came to Britain. Sunday Times, October 15th 1972.