10 THE COLLIERY GUARDIAN. January 7, 1916. “HARDIAX” “ALL STEEL” Coal-Cutter (Patented) Absolutely unequalled by anything hitherto placed on the market. Fastest and most durable percussive coal- cutter extant—Steel from end to end. 30 “Hardiax” machines have been installed by a large North of England Colliery Company. I Ask for New Catalogue. SENT ON FREE TRIAL. THE HARDY PATENT PICK CO. LTD., SHEFFIELD.