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Reference Number	D8/L3/108
Title	Papers re: Patent Application No. 27940 - Improved Indicator of Consumption of Gas and Electricity
Description	Correspondence with Barker, Brettell & Duncan, Chartered Patent Agents, Birmingham re: Cannon's application for a patent for an improved indicator of the consumption of gas and electricity.
Date	Oct 1939-Jun 1940
AccessStatus	Open
Level	File

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