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horstmann: sustained dependability
Published in: Public Lighting Engineer No. 43, Vol. 11, October-December 1946
Published in: Public Lighting Engineer No. 44, Vol. 12, January-March 1947
Published in: Public Lighting Engineer No. 45, Vol. 12, April-June 1947
Published in: Public Lighting Engineer No. 46, Vol. 12, July-September 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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