Jisho

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こうくうしょうがいとう 航空障害灯
Noun
1. aircraft warning lights; airplane warning lights; obstacle light; obstruction light
Wikipedia definition
2. Aircraft warning lightsAircraft warning lights are high-intensity lighting devices that are attached to tall structures and are used as collision avoidance measures. Such devices make structures more visible to passing aircraft and are usually used at night, although they may be used during the day as well. These lights need to be of sufficient brightness in order to be visible for miles around the structure.
Read “Aircraft warning lights” on English Wikipedia
Read “航空障害灯” on Japanese Wikipedia
Read “Aircraft warning lights” on DBpedia

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