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ediswan: designed for simple maintenance
Published in: Public Lighting Engineer Vol. 18, No. 75, June 1953
Published in: Public Lighting Engineer Vol. 18, No. 76, September 1953
Published in: Public Lighting Engineer Vol. 18, No. 77, Special Conference Issue 1953
Published in: Public Lighting Engineer Vol. 18, No. 78, December 1953