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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	keith and blackman: high pressure gas lamps 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 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