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• Northey, J. W.
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  Telephones for Giving the Alarm?
  Fire Surveyor, Vol. 17, No. 3, 30-31, June 1988

• Northey, J. W.
  view article (1.0)

  Smoke Detectors: Optical or Ionisation.
  Fire Surveyor, Vol. 9, No. 2, 20-23, April 1980