Papers, correspondence and diagrams relating to invention of Oldfield Shield for gate ripping shoulders at Holmewood Colliery, invented by F. Oldfield Comprising file with two letters on appeal tribunal against decision by the Divisional Awards Panel, 22-23 Feb 1966, copy of description of invention signed by F. Oldfield, with tables on production units, accident summary, and details of individual accidents (columns for name of worker, date, nature of injury, part of body injured, place, occupation, cause of accident and number of work days lost) for the period back to 1 June 1964, summary of safety aspects features, and costings: and isometric diagram and plan and sections of shields for ripping shoulders, scale 2 feet to 1 inch, by Holmewood Survey Department Feb 1966