File:Hazen's Kratometer ("American medical directory", 1906 advert).png
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![File:Hazen's Kratometer ("American medical directory", 1906 advert).png](https://upload.wikimedia.org/wikipedia/commons/thumb/9/9f/Hazen%27s_Kratometer_%28%22American_medical_directory%22%2C_1906_advert%29.png/432px-Hazen%27s_Kratometer_%28%22American_medical_directory%22%2C_1906_advert%29.png?20210310001957)
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