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Reference Number	D8/F3/5/6
Title	Extracts from Invoices from Barker, Brettell & Duncan, Chartered Patent Agents
Description	Extracts from the 'Accounts of Barker, Brettell & Duncan', the Patent Agents who dealt with Cannon's numerous patents and trademarks, both in Britain and overseas. See also: D8/L1/1-5 for records of patents and trademarks.
Date	Mar 1840-Jun 1950
AccessStatus	Open
Level	File

Record