Leveling Device For Azimuth Sub-compass.

Lub azimuth sub-compass feem ntau yog ntsia rau ntawm ob sab ntawm lub cab. Nws yog synchronized nrog lub ntsiab compass. Tus neeg teb xov tooj tuaj yeem siv lub azimuth sub-compass ua ke nrog lub voj voog azimuth kom yooj yim soj ntsuam cov kev taw qhia ntawm cov khoom (xws li lub cev xilethi-aus).

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