A rechargeable light curing apparatus having at least one hand-operated device with a handle and an on/off switch and a recharging unit to which said hand operated device can be mechanically and electrically coupled. The hand-operated device has a battery pack with at least one accumulator and an electrical...http://www.google.fr/patents/US5471129?utm_source=gb-gplus-shareBrevet US5471129 - Rechargeable light curing apparatus
