1. Egerton Ch 7686 Reference (shelfmark): Egerton Ch 7686 Title: Scope & Content: Inventions: Signet Warrants for patents for inventions: 1717-1725. John Theophilus Desaguliers, LLD, FRS (ob. 1744): Signet Warrant for inventor's patent to: 1720. Collection Area: Western Manuscripts Languages: English Date Range: 1720 Extent: 1 item