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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 52 - Board of Trade: Patents, Designs and Trade Marks Office and successors: Patents and Designs Act, 1907 and Registered Designs Act, 1949 Design...
- Subseries within BT 52 - Textile Designs Classes 13, 14 and 15 Representations