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of Lincoln Works, Chesterfield
1900 Clench and Co amalgamated with Bryan Donkin and Co; re-registered as Bryan Donkin and Clench Ltd. Bryan Donkin, Junior continued as chairman but relinquished active participation in the management of the works.
1903 Donkins moved to Chesterfield.
1903 Catalogue issued on 1903 list of gas-exhausting plants and gas valves. 
1906 Private company. Again renamed as Bryan Donkin Co Ltd.