Jisho

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Wikipedia definition
1. Clear view screenClear View Screens were originally developed in the mid 1930s for automobiles as a better option than standard windshield wipers but were soon found more suitable for small boats and larger ships. On ships, a clear view screen or clearview screen is a glass disk mounted in a window, usually on the bridge, that rotates at high speed (~1500 rpm) to disperse rain, spray, and snow.
Read “Clear view screen” on English Wikipedia
Read “旋回窓” on Japanese Wikipedia
Read “Clear view screen” on DBpedia

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