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| Keywords: Description of the Le Roy detent escapement mechanism 14 August 1748.jpg _of_the_Le_Roy_detent_escapement_mechanism_14_August_1748 http //forumamontres forumactif com/revues-videos-photographies-fiches-pratiques-f2/exclusif-l-histoire-de-la-montre-sur-forumamontres-t5381 htm Academie des Sciences France 14 August 1748 1748-08-14 PD-old-100 Escapements Pierre Le Roy Old horology prints | ||||
