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siemens: planned street lighting
Published in: Public Lighting Engineer No. 47, Vol. 12, Special Conference Issue, November 1947
Published in: Public Lighting Engineer No. 48, Vol. 12, October-December 1947
Published in: Public Lighting Engineer No. 49, Vol. 13, January-March 1948
Published in: Public Lighting Engineer No. 50, Vol. 13, April-June 1948
Published in: Public Lighting Engineer No. 51, Vol. 13, July-September 1948
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