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12 h 1 janv. 1931 ans - Ophthalmograph and Metronoscope Devices

Description:

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.

Ajouté au bande de temps:

Date:

12 h 1 janv. 1931 ans
Maintenaint
~ Il y a 94 ans