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son of James Marshall
1929 Obituary 
HERBERT JOHN MARSHALL, chairman and managing director of Messrs. Marshall, Sons and Company was trained at University College, London under Professor Kennedy from 1881 to 1884.
After further study in France and a year at Hanover, he entered the works of Messrs. Marshall, and after gaining several years' experience he entered upon the management of the engineering departments.
His professional career was almost exclusively devoted to the improvement of the standard types of engines and machines with which his firm is associated, and in that connexion he took out a considerable number of patents. The design and development of high-power tractors and thrashing machines of steel construction were his outstanding achievements.
Mr. Marshall's death occurred on 22nd May 1929, and he had been a Member of the Institution since 1897.
1929 Obituary