U.S. Naval Observatory, Washington. Armature and field magnets of two-phase synchronous motor which drives micrometer (titre original)

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inconnu, “U.S. Naval Observatory, Washington. Armature and field magnets of two-phase synchronous motor which drives micrometer (titre original),” Bibliothèque numérique - Observatoire de Paris, consulté le 1 mai 2024, https://bibnum.obspm.fr/ark:/11287/1CRWL.