Thomas Ripley: Signet Warrant for inventor's patent to: 1722. Richard Holt: Signet Warrants for inventor's patents to: 1722. Inventions: Signet Warrants for patents for inventions: 1717-1725.
Samuel London: Signet Warrant for inventor's patent to: 1722. Inventions: Signet Warrants for patents for inventions: 1717-1725. Richard Holt: Signet Warrants for inventor's patents to: 1722.