Letter from A. F. Spooner, Chartered Patent Agent, 323 High Holborn, London, to James Mackenzie Davidson 'We enclose herewith notification of renewal on your Interrupter Patent due early in February next. We have also looked up the account we sent you on April 28th last and we find that this showed a balance in favour of £1.18.2. In order to clear matters between us if you will send us a cheque for £10.0.0. and a formal acknowledgement of the £1.18.2 in question, it will enable us to meet the renewal now due.' 11 December 1909