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B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
B23K28/00—Welding or cutting not covered by groups B23K5/00 - B23K26/00
B23K28/02—Combined welding or cutting procedures or apparatus
Method and device for drilling a thick metal workpiece, and especially an item of armour plating made of steel having a thickness of several tens of centimetres