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

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“U.S. Naval Observatory, Washington. Armature and field magnets of two-phase synchronous motor which drives micrometer,” Bibliothèque numérique - Observatoire de Paris, consulté le 20 janvier 2019, https://bibnum.obspm.fr/ark:/11287/zch6d.