File:Patent filings in the field of fuel cells by year of filing (1950–2020).png
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current | 12:32, 12 July 2022 | ![]() | 800 × 831 (66 KB) | Mattdpat | Uploaded a work by WIPO from https://www.wipo.int/edocs/pubdocs/en/wipo-pub-1076-en-patent-landscape-report-hydrogen-fuel-cells-in-transportation.pdf with UploadWizard |
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