FIRST Jeopardy 2.0! (5/7)

Yay, reminder of all questions being at 22:00 EST!

Technology for 200, this everyday invention was first unvailed at the USA’s Centennial Exposition. Remember to PM me the answer within 50 minutes.

5/7

Technology for 200, this everyday invention was first unvailed at the USA’s Centennial Exposition.

Telephone

Pat Fairbank (200), gwross (-200), Alex Pelan (88), sanddrag (70)