1. Egerton Ch 7457 Reference (shelfmark): Egerton Ch 7457 Title: Scope & Content: Inventions: Signet Warrants for patents for inventions: 1717-1725. George Campbell, merchant, of Edinburgh: Signet Warrant for inventor's patent to, for manufacturing salt: 1717. Collection Area: Western Manuscripts Languages: English Date Range: 1717 Extent: 1 item