Réponse :
a. Samuel Morse sent the first telegraph message in 1844.
b. The first chewing-gum was sold by John Curtis in 1848.
c. In 1884, Waterman made the first fountain pen.
d. Judson invented the zipper in 1891.
e. The e-mail was invented in 1972 by Ray Tomlinson.
Explications :
