Which of the following was an initial result of the improvement of the light bulb? A. Factories could stay in production during night hours.
B. Lower class homes had lights installed. C. Cars could go faster.
D. People could talk to each other directly.

This is what i found on google “the first mobile phone call was made 40 years ago today. on april 3, 1973, motorola employee martin cooper stood in midtown manhattan and placed a call to the headquarters of bell labs in new jersey.” i hope this you for what your looking.