A dental X-ray diagnostic apparatus in which the setting of the adjustable exposure value, is automatically carried out. A ray detector is applied to the film carrier, which delivers an electrical signal in conformance with the dose rate when it is struck by X-radiation and which, together with the setting...http://www.google.com.au/patents/US4021672?utm_source=gb-gplus-sharePatent US4021672 - Dental X-ray diagnostic installation
