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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	s&l: tubular steel poles Published in: Public Lighting Engineer No. 41, Vol. 11, April-June 1946 Published in: Public Lighting Engineer No. 42, Vol. 11, July-September 1946 Published in: Public Lighting Engineer No. 43, Vol. 11, October-December 1946