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Horstmann: Over 1500000 3A Clock Movements Have Been Produced
Published in: Public Lighting Engineer Vol. 18, No. 74, March 1953
Published in: Public Lighting Engineer Vol. 18, No. 75, June 1953
Published in: Public Lighting Engineer Vol. 18, No. 76, September 1953
Published in: Public Lighting Engineer Vol. 18, No. 77, Special Conference Issue 1953
Published in: Public Lighting Engineer Vol. 18, No. 78, December 1953