File:Balance Wheel in Early Watch Berthoud.png

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	12:14, 6 July 2007		464 × 366 (37 KB)	Chetvorno	{{Information \|Description=Illustration of a balance wheel in an early watch, by a master watchmaker of the 19th century. From Ferdinand Berthoud (1811), ''L'art de Conduire et de Regler les Pundules et les Montres'' \|Source=http://books.google.com/book

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