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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	keith and blackman: the new gas lamp that is revolutionizing street lighting Published in: Public Lighting Engineer No. 12, Vol. 4, January 1939 Published in: Public Lighting Engineer No. 13, Vol. 4, April 1939 Published in: Public Lighting Engineer No. 14, Vol. 4, July 1939