1. Egerton Ch 7961 Reference (shelfmark): Egerton Ch 7961 Title: Scope & Content: Martin Triewald, of Newcastle upon Tyne: Signet Warrant for inventor's patent to: 1722. Inventions: Signet Warrants for patents for inventions: 1717-1725. Collection Area: Western Manuscripts Languages: English Date Range: 1722 Extent: 1 item