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  1. Human energy harvesting and storage system - Google Patents

  2. Patents Granted on 1897-??-?? - datamp.org

  3. CALIFORNIA LEVEL PATENTS - pasttools.org

  4. Patent #588,916, United States Patent Office, Aug. 24, 1897

  5. Patent Issue Date Details For 1897 - DATAMP

  6. 'Los Padres National Forest Homestead Patent' | 1897 | 160 acres …

  7. Index of patents relating to electricity : embracing patents issued …

  8. 1897 Patented California Land Patent Updates