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bth: save electricity
Published in: Public Lighting Engineer No. 25, Vol. 7, April-June 1942
Published in: Public Lighting Engineer No. 28, Vol. 8, January-March 1943
Published in: Public Lighting Engineer No. 29, Vol. 8, April-June 1943
Published in: Public Lighting Engineer No. 30, Vol. 8, July-September 1943