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[Subject: Precision & Other Instruments]
- Cadran au centre duquel un pivot supporte une aiguille aimantée mobile qui, au repos, indique la direction du nord magnétique
Translated by: MAURIZIO FERRIN
Translated in 107 languages
[Subject: Astronomy & Allied Sciences]
Translated by: DAVID LAURENT
Translated in 8 languages
Translated in 5 languages