1890 I Think
vermilon
It is believed that the first baby monitor was made in the 1930's by a man named Norman Emerick of Fisher-Price. The baby monitor was invented after an incident wherein Charles Lindbergh's 20 month old baby was kidnapped. The first baby monitor worked by using radio waves to transmit sound waves from one room to another.
The first RGB monitor had the colors red, green, and blue light that are added together in various ways to reproduce a variety of colors. It was invented my M. George Craford.
The PC monitor, was developed from the CRT tube. It was first used in computing by the EDSAC, which also used it to store data.
computer, the first were huge machings punching out numbers on a card
Allen B. Dumont; 1972... i think
1949
Monitor
thalia gray invented computer monitor in 2002
The first person to invent the monitor was Allen B. DuMont in the year 1920.
the computer monitor