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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.

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.

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.

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.