4. Who invented a tungsten filament, which lasted
even longer compare with the older filaments in
year 1910?
A Willis Whitney
B. Lewis Latimer
C. Humphry Davy
D. William Coolidge​


Sagot :

Answer:

D.William Coolidge

Explanation:

William Coolidge invented a tungsten filament, which lasted

even longer compare with the older filaments in

year 1910