Number of water technology-related patents worldwide 1992-2021, by leading institute
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https://www.statista.com/statistics/1600851/number-ipfs-water-technology-worldwide-by-leading-institute/
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Number of water technology-related applications of international patent families (IPFs) worldwide from 1992 to 2021, by leading university or public research institute
1992年至2021年全球范围内，按顶尖高校或公共研究机构分类的水技术相关国际专利族（international patent families, IPFs）申请数量
