Who spoke Mr. Watson Come here I need you?

The sentence, 'Mr. Watson, come here, I want you!' was famously recorded as being said by Alexander Graham Bell into the first telephone on March 10 1876 in Boston, Mass. to his assistant Thomas Watson. The phone was made of a wooden stand, a funnel, a cup of acid, and copper wire which transmitted his voice to Mr. Watson listening in on a receiver in another room.