Explanatory notes
… turning, cutting, morticing or drawing, etc., metals, metal carbides, wood, stone, ebonite, certain plastics or other … oil well drilling or sounding tools (e.g. augers, boring bits and drills). (2) Dies for drawing or extruding metal … drilling , including drills (spiral or twist drills, centre bits, etc.), brace bits, etc. (6) Tools for boring or …