Gt. Britain. National Coal Board.

• A.B. Longwall Trepanner
• Armstrong Airbreaker at Bank Hall Colliery
• C.E.E. Dust-Suppression Jib
• Climax S.W.2B Water-Controlled Pick
• Construction in Reinforced Concrete at A Dutch Colliery
• Design of Fan Drifts
• Dosco Miner
• Drilling Methane Drainage Boreholes in Hard Strata with the Nusse and Grafer P.4/6 Machine
• Dust Suppression on Anderton Shearer Loaders
• Experience in Compressed-Air Blasting
• Filling A Roof Cavity at A Roadhead
• Firedamp Drainage Trials with Cross-Measure Boreholes