File:Number of patent families related to hydrogen fuel cell technologies in transport by year of first filing, from 2000 to 2020.png
Jump to navigation
Jump to search
Size of this preview: 601 × 599 pixels. Other resolutions: 241 × 240 pixels | 481 × 480 pixels | 786 × 784 pixels.
Original file (786 × 784 pixels, file size: 77 KB, MIME type: image/png)