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new manufacturers installations collection restorations timeline identification publications glossary mailing list site map links about contact	broads: an important innovation Published in: Public Lighting Engineer Vol. 12, No. 46, July-September 1947 Published in: Public Lighting Engineer Vol. 12, No. 47, Special Conference Issue, November 1947 Published in: Public Lighting Engineer Vol. 12, No. 48, October-December 1947