Head unit for dental x-ray unit by Watson, c. 1924, with Coolidge x-ray tube by General Electric, United States, 1920-1929. Head unit for dental x-ray unit by Watson 1920-1929
Head unit for Watson dental x-ray set, complete with x-ray tube, made by Muller, Germany, 1920-1924. Head unit for Watson dental x-ray set 1920-1924