O1
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Caerwine
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USS O-1
{{seealso|01}}
'''O1''' or '''O-1''' may be referring to:
*[[O-1 Bird Dog]], an observation aircraft manufactured by Cessna
*[[Curtiss Falcon|O-1 Falcon]], an observation aircraft manufactured by the Curtiss Aircraft Company
*[[O-1 Airship]], an Italian manufactured semi-rigid airship operated by the US Navy
*[[USS O-1 (SS-62)|USS ''O-1'' (SS-62)]], lead ship of the United States O class submarines
*[[O-1 visa]]
* '''O1 star''', a subclass of O-[[stellar classification|class stars]]
* Y-DNA [[Haplogroup O1 (Y-DNA)|Haplogroup O1]]
* [[Otoyol 1]], [[List of highways in Turkey|Turkish highway]] around Istanbul
* [[Austrian Radio Ö1 International]]
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[[it:O1]]