Optical-fiber lighting unit, preferably intended for dental work, and comprising a casing (1) wherein there is provided an optical system (12) to which a plurality of optical-fiber conductors (27) are optically connectable via a light switch (26). The light switch (26) comprises an optical device, for...http://www.google.es/patents/US4623217?utm_source=gb-gplus-sharePatente US4623217 - Optical-fiber lighting unit having a movable lamp holder
Optical-fiber lighting unit having a movable lamp holder
