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- BT - Records of the Board of Trade and of successor and related bodies
- Division within BT - Records of the Patent Office
- BT 53 - Board of Trade: Patents, Designs and Trade Marks Office and successors: Patents and Designs Act, 1907, and Registered Designs Act, 1949: Designs...
- Subseries within BT 53 - Non-textiles Registrations, Classified Summaries