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Wikipedia definition
1. Proximity fuzeA proximity fuze is a fuze that is designed to detonate an explosive device automatically when the distance to target becomes smaller than a predetermined value or when the target passes through a given plane. The proximity fuze should not be confused with the common contact fuze. One of the first practical proximity fuzes was codenamed the VT fuze, an acronym of “Variable Time fuze”, as deliberate camouflage for its operating principle.
Read “Proximity fuze” on English Wikipedia
Read “近接信管” on Japanese Wikipedia
Read “Proximity fuze” on DBpedia

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