Respuesta :

Answer:

Braille. In 1824, a 15 year old Louis Braille first presented his system of written communication, today known simply as braille. ...

Explanation:

Bonjour !

Answer:

-  Braille. In 1824, a 15 year old Louis Braille first presented his system of written communication, today known simply as braille.

- The stethoscope. (Paris)