[Sources]
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Changing headgears at Pleasley Colliery, Longden G.A. Trans. Inst Mining Eng. Vol ... July-Dec 1901. Ref No. D/X 1543/176
N.C.B. Durham Division No. 6 Area, Directed Practical Training Scheme, Report No. 5, by J. Dunn, D.P. Trainee (Mech.), covering mechanisation at Watergate Colliery; Victor Compressed Air (Power feed drill), Butterly Tub Vibrator, No. 2 Surface Empty Tub Creeper; Ingersoll - Rand Air Compressor, 'Bennet' Safety Catch Gear - Garth Headgear, 15 August - 10 September 1955
(3 papers, typescript)
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