1108 THE COLLIERY GUARDIAN. May 30, 1913. Hardy Simplex” Hammer Drills have just been bought by two large Continental Colliery Companies after lengthy experience of other types. Why need British Collieries buy foreign=made machines ? The above striking success confirms the splendid wins in this country by SIMPLEX drills over competing makes in open competition. SENT ON FREE TRIAL AGAINST the HARDY PATEHT PICK CO. LTD SHEFFIELD.