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1923
Demonstration of the first projector for a projection planetarium (Mark I)
1922
Parallax refractometer for testing visual acuity
1919
Eye irradiation apparatus for tuberculosis
1912
Punktal® eyeglass lenses – identical imaging over a large range of vision for the first time
1911
Large ophthalmoscope for reflection-free observation of the fundus (back wall) of the eye and Gullstrand’s slit lamp
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