WHAT WAS EDISON WORKING ON WHEN HE CREATED THE PHONOGRAPHA. A TELEG...
3. What was Edison working on when he created the phonograph
A. A telegraph repeater
B. A telegraph diaphragm
C. A telephone repeater
D. A telephone diaphragm
3. What was Edison working on when he created the phonograph
A. A telegraph repeater
B. A telegraph diaphragm
C. A telephone repeater
D. A telephone diaphragm