Dark-ground microscope condenser, in box, by Reichert, Austrian, 1950-1965 Dark-ground microscope condenser 1950-1965
Dark-ground microscope condenser, in box, by Leitz, German, 1955-1970 Dark-ground microscope condenser 1955-1970
Dark-ground microscopy condenser, in box, by W. Watson and Sons Ltd, English, 1940-1960 Dark-ground microscopy condenser 1940-1960