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12 h 1 ene 1931 año - Ophthalmograph and Metronoscope Devices

Descripción:

Earl, James, and Carl Taylor created the Ophthalmograph and Metronoscope, devices used to record the movement of eyes while reading and tools that trained people to read more effectively.

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12 h 1 ene 1931 año
Ahora mismo
~ 94 years ago