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BS 6111:1981Specification for reference coupler for the measurement of hearing aids using earphones coupled to the ear by means of ear insertsstandard by BSI Group, 06/30/1981
BS 3A 125 TO 3A:1981Specification for Stiffnuts (Unified threads) for aircraftstandard by BSI Group, 06/30/1981
BS 3680-4C:1981Methods of measurement of liquid flow in open channels. Weirs and flumes. Flumesstandard by BSI Group, 06/30/1981
BS 6031:1981Code of practice for earthworksstandard by BSI Group, 06/30/1981
BS 3A 125 TO 3A:1981+A1:2013Specification for Stiffnuts (Unified threads) for aircraftstandard by BSI Group, 06/30/1981
BS 1000[63/632]:1981Universal Decimal Classification. English full edition. Agriculture in general. Forestry. Plant injuries, diseases and pests. Plant protectionstandard by BSI Group, 06/30/1981
BS 4682-3:1981Methods of test for dimensional stability of textile floor coverings. Determination of dimensional changes after exposure to heatstandard by BSI Group, 04/30/1981
BS PD 6470:1981The management of design for economic production. Standardization philosophy aimed at improving the performance of the electrical and mechanical manufacturing sectorsstandard by BSI Group, 04/30/1981
BS 799-3:1981Oil burning equipment. Automatic and semi-automatic atomizing burners up to 36 litres per hourstandard by BSI Group, 04/30/1981
BS 448-1:1981Dimensions of electronic tubes and valves. IEC dimensionsstandard by BSI Group, 04/30/1981
BS 9493:1981Rules for the preparation of detail specifications for integrated circuits of assessed quality which perform mixed digital and/or analogue functionsstandard by BSI Group, 04/15/1981
BS 3643-1:1981ISO metric screw threads. Principles and basic datastandard by BSI Group, 03/31/1981