Improvements in or relating to carbon savers for carbon arc lamps

摘要

646,095. Drilling; tapping. HIRST, E. N. April 27, 1948, No. 11471. [Class 83 (iii)] [Also in Group XL (a)] A tool for drilling and tapping the end of a rod comprises a clamp 5 for supporting the rod 1 against a seating 6 containing an aperture 7 through which the drill or tap 8 may be guided.