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Glossary of watchmaking

Planing machine

Machine à raboter les dentures | 歯車加工機/ハグルマカコウキ | 龙门刨床

Until the end of the eighteenth century, watchmakers would plane teeth and leaves on wheels and pinions by hand, first dividing them with special files. Later, for around a century, a planing machine fitted with special files was used (although not systematically) instead. Invention of this machine is attributed to Abraham-Louis Perrelet of Le Locle (Switzerland).