A screw driver includes an illuminating unit fixed to a slidable member slidably mounted on the shank of the screw driver. The slidable member also has a holding member by which it can stay stationary on the shank....http://www.google.es/patents/US5124893?utm_source=gb-gplus-sharePatente US5124893 - Screw driver having illuminating means mounted thereto
Screw driver having illuminating means mounted thereto
