When was the pager-like system invented?

Retry
Correct
Incorrect
The Detroit Police Department is credited with inventing the first-ever pager, also known as a beeper, in 1921. However, it wasn’t until 1949 that Al Gross invented and patented the first telephone pager.
Bettmann/Getty Images
Bettmann/Getty Images
When was the pager-like system invented?
- 1920
- 1960
- 1980
- 1990
Scroll down to continue on!