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National College for Heating, Ventilating, Refrigeration and Fan Engineering Con objetos digitales
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N. S. Billington, A. E. Leach, R. Duncan Wallace, G. Evans and E. G. Batt
N. S. Billington, A. E. Leach, R. Duncan Wallace, G. Evans and E. G. Batt
Mrs M. Ormerod, J. W. Cooling and H. D. Mains
Mrs M. Ormerod, J. W. Cooling and H. D. Mains
George Tomlinson, Hubert A. Secretan, F. Bray and Dr Ingall
George Tomlinson, Hubert A. Secretan, F. Bray and Dr Ingall
F. J. Packer, J. M. Archer and L. Green
F. J. Packer, J. M. Archer and L. Green