B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
B23B—TURNING; BORING
B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels
Appareil et procede d'usinage de trous de centrage dans des pieces et de rectification simultanee, sans encre, de surfaces de revolution exterieures