English: This is a facsimile of Mr. Darrac's invention (brevet) for 5 years granted on August 21, 1812
Date
Source
French public archives (Paris). Immediate source: "Description des Machines et Procédés Specifies dans les Brevets d'Invention, de Perfectionnement et d'Importation, pg. 103
Author
M. Christian, Directeur du conservatoire Royal Arts et Métiers
Licensing
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