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Records of British Chemical Projects (Iridion) Limited, comprising articles of association; indenture; correspondence with the Trade Marks branch of the Patent Office; correspondence with Haseltine, Lake and Co, chartered patent agents; and certificates of trademarks issued in the UK, Argentina, Canada, Australia, New Zealand, Belgium and France, 1927-1929.

Records of the Chartered Gas Light and Coke Company, 1812-1949, including Director's meeting minutes; Proprietors' Meeting minutes; Committee of Accounts, Finance and Audit minutes; Committee of Works minutes; Committee of Works and Products minutes; Committee of Chemistry and Machinery minutes; Committee of Light and Experiments minutes; Committee on Machinery and Works minutes; Committee on the Provision for Wear and Tear minutes; financial accounts; map of London Gas Companies' Districts; evidence presented to various Committees including Select Committees; proceedings in Parliament relating to the gas companies; and Gas Light and Coke Company's Acts, Charter and Bye-Laws.

Collection of documents relating to national events or institutions. The documents relate to varied subjects including Parliamentary elections and proceedings; taxation including tax assessments, tax agents and accounts; military commissions; the Tower of London; excise; military orders; passwords issued by royalty; bankruptcies; militia; licences; warrants; petitions; and patents.

Grant of letters patent (including a great seal) issued to Edwin William Thomas and Edward Nightscales for an improved self acting steam water lift and injector.