![[Description of a machine for teaching blind persons arithmetic]](/_next/image?url=https%3A%2F%2Fcovers.openlibrary.org%2Fb%2Fid%2F8226738-L.jpg&w=3840&q=75)
[Description of a machine for teaching blind persons arithmetic]
1793144 pages
[publisher not identified]·1 editions
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