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gec: osram the wonderful lamp
Published in: Public Lighting Engineer No. 17, Vol. 5, April 1940
Published in: Public Lighting Engineer No. 28, Vol. 8, January-March 1943
Published in: Public Lighting Engineer No. 30, Vol. 8, July-September 1943
Published in: Public Lighting Engineer No. 32, Vol. 9, January-March 1944
Published in: Public Lighting Engineer No. 33, Vol. 9, April-June 1944
Published in: Public Lighting Engineer No. 34, Vol. 9, July-September 1944
Published in: Public Lighting Engineer No. 36, Vol. 10, January-March 1945
Published in: Public Lighting Engineer No. 39, Vol. 10, October-December 1945
Published in: Public Lighting Engineer No. 40, Vol. 11, January-March 1946