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Public domainPublic domainfalsefalse
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https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
Leonard Niedrach (left) and Thomas Grubb (right), inventors of proton-exchange membrane technology.
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| Date/Time | Thumbnail | Dimensions | User | Comment |
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03:45, 19 April 2021 |
| 616 × 755 (104 KB) | TheChemistTree | Uploaded a work by Smithsonian Institution from https://siarchives.si.edu/collections/siris_arc_384525 with UploadWizard |
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