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Common clock escapements: A description of common escapements and practical workshop methods for mechanical clocks ancient and modern - Paperback 
Common clock escapements: A description of common escapements and practical workshop methods for mechanical clocks ancient and modern - Paperback
Common clock escapements: A description of common escapements and practical workshop methods for mechanical clocks ancient and modern - Paperback
By Laurence W. Penman and Laurie Penman
