Butterley Company correspondence file on the setting of wage rates of winding enginemen in Nottinghamshire and Derbyshire Including copies of agreements including winding enginemen, 24 May 1922 and 21 Sep, with agreement for other classes of workers, 24 May 1937 and for Ollerton Colliery winding enginemen 15 Aug 1942, and loose wages accounts for Denby Hall Colliery winding enginemen claiming for weeks ending 12 Dec 1936-30 Jan 1937 Jan 1927-Sep 1942