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12 ore 1 gen 1931 anni - Ophthalmograph and Metronoscope Devices

Descrizione:

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.

Aggiunto al nastro di tempo:

Data:

12 ore 1 gen 1931 anni
Adesso
~ 94 years ago