740 THE COLLIERY GUARDIAN. April 13, 1917. S£ “HARDIAX” “ ALL STEEL ” Coal-Cutter (Patented). ABSOLUTELY UNEQUALLED BY ANYTHING HITHERTO BRACED 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. Ask for New Catalogue. TRIALS ARRANGED. THE HARDY PATENT PICK CO. LTD., SHEFFIELD.