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keith and blackman: raising and lowering gear
Published in: Public Lighting Engineer No. 6, Vol. 2, June 1937
Published in: Public Lighting Engineer No. 7, Vol. 2, September 1937
Published in: Public Lighting Engineer No. 8, Vol. 2, December 1937
Published in: Public Lighting Engineer No. 9, Vol. 3, March 1938
Published in: Public Lighting Engineer No. 10, Vol. 3, June 1938
Published in: Public Lighting Engineer No. 11, Vol. 3, September 1938